How Many Days of Food and Water Should You Actually Store?
There’s no single official number, and pretending otherwise would be dishonest. Here’s what each authority actually publishes:
| Source |
Recommendation |
| FEMA / Ready.gov |
Several days’ food in an airtight, waterproof container, several days’ water, plus a bowl, tied to FEMA’s general 3-day (72-hour) minimum disaster-supply framing |
| ASPCA |
7-10 days’ worth of food and at least 7 days’ worth of bottled water per pet, per its main disaster-preparedness page; a separate ASPCA prep-kit article says “plan for three to seven days’ worth of food and bottled water per pet” |
| Humane World for Animals |
“Food and water for at least five days for each pet,” plus an extra gallon of water in case a pet needs rinsing after chemical or floodwater exposure |
Read those together and a practical target emerges: 3 days is the floor nobody should go below, 5 days is Humane World’s stated minimum, and 7 days clears the bottom of the ASPCA’s current range. If your carrying capacity and storage space allow it, build toward the 7-day end rather than stopping at FEMA’s minimum; the ASPCA’s full 7-10 day food figure fits better in the at-home shelter-in-place reserve covered in the long-term storage guide linked above. A 3-day supply assumes help arrives fast, and evacuations don’t always cooperate with that timeline.
Scale everything below by the number of pets in your household. A 5-day plan for one cat and a 5-day plan for two dogs and a cat are different shopping lists; do the math per animal, not per household.
Water Math: How Much Your Pet Actually Needs Per Day
The most commonly cited estimate for dogs is roughly 1 ounce of water per pound of body weight per day. PetMD publishes it as “approximately 1 ounce of water (1/8 of a cup) per pound of body weight each day”, on a page reviewed by Jennifer Larsen, DVM, PhD. That is DVM review, which is real credentialing, and it is also the ceiling of what this figure’s authority actually is.
It is not an ASPCA figure, and we want to correct that here because this page used to say it was. The ASPCA’s disaster-preparedness page publishes day counts and no per-pound math at all. There is a separate September 18, 2025 ASPCA news post that does carry the line “typically one ounce per pound of body weight per day”, and if you only search the domain that looks like confirmation. Read the block it sits in and it is not. The post introduces Rachael Ray as a “longtime ASPCA supporter” who is “adding some of her key tips to our expert list”, and the water sentence appears under the heading “Extra Tip from Rachael.” Hosting on aspca.org is not ASPCA authorship, and a figure carried in a supporter’s tip box is not a veterinary recommendation from the organization. The number itself is unchanged and still usable. What changed is that we are no longer telling you an animal-welfare authority stands behind it.
It is a planning estimate rather than a locked spec, because an individual animal’s real needs shift with size, heat, stress, and health, and prep-focused sources do not even agree with each other on the rate. For a fuller per-dog breakdown by weight, the competing rates, and the worked storage math, see how much water a dog needs in an emergency.
Here’s what that looks like at a few common weights:
| Dog’s weight |
Approx. daily water |
5-day supply |
7-day supply |
| 10 lbs |
~10 oz (1.25 cups) |
~50 oz (0.4 gal) |
~70 oz (0.55 gal) |
| 25 lbs |
~25 oz (~2 cups + a bit) |
~125 oz (~1 gal) |
~175 oz (~1.4 gal) |
| 50 lbs |
~50 oz (~0.4 gal) |
~250 oz (~2 gal) |
~350 oz (~2.7 gal) |
| 90 lbs |
~90 oz (~0.7 gal) |
~450 oz (~3.5 gal) |
~630 oz (~4.9 gal) |
Do not extend the per-pound rate above to a cat. This page used to tell you to scale the dog figures down using your cat’s actual weight, and it should not have: the 1 oz/lb figure is published about dogs, and no authority we reached publishes a per-pound daily water figure for a cat. What is published for cats is day counts, which our best cat go-bags page carries in full, and if you want a number tuned to your specific cat that is a question for your veterinarian. We are not going to invent one. If you have a multi-pet household, add each animal’s daily figure separately rather than eyeballing a household total; our multi-pet go-bag math guide walks through that addition for mixed-species households.
Two things push water needs above this baseline, and both matter during an actual emergency:
- Heat. A dog panting through a hot evacuation day needs more than its baseline number. Build in a margin rather than packing the exact calculated minimum.
- Stress or illness. A frightened or sick animal’s fluid needs can shift in either direction, another reason a 5-7 day cushion beats a bare 3-day minimum.
As a rough anchor point, the CDC’s general (non-pet-specific) human guidance is 1 gallon of water per person per day. Several secondary sources extend that same 1-gallon baseline as a starting reference for pets too, but that’s a secondary-source extrapolation, not a Ready.gov or CDC figure written specifically for animals. Use the per-pound math above for your actual pet planning, and treat the 1-gallon figure only as a human-household cross-reference.
Water quality matters as much as quantity. If tap water isn’t safe for a human to drink during a boil-water advisory or contamination event, it isn’t safe for a pet either, and pets shouldn’t be allowed to drink from floodwater, puddles, or other unknown sources during a disaster. If your plan leans on filtering found water rather than carrying every ounce, our dog water filter for a bug-out bag guide covers what those filters do and do not remove.
Wet Food vs. Dry Food for Emergency Storage
Neither format is strictly “better.” They trade off differently, and most households end up using both.
Dry kibble’s advantages:
- Much longer shelf life: unopened dry food is commonly cited as good for 12-18 months from its manufacture date when stored properly
- Far lighter per calorie, which matters if the food needs to travel in a go-bag
- Simpler storage: an airtight container is the whole solution
Dry kibble’s tradeoff: low moisture content means your pet is entirely dependent on separate water access. Kibble doesn’t supplement hydration in any meaningful way.
Wet/canned food’s advantages:
- Unopened cans can last a long time in storage thanks to the sterile canning process
- Higher moisture content (commonly cited around 75-85%) can help supplement hydration somewhat, though it’s not a substitute for offering water directly
Wet food’s tradeoff, and it’s a real one during an evacuation: the FDA is specific that opened canned or pouched food needs refrigeration at 40°F or below and should be used within a few days. If you’re evacuated without power, that clock is a genuine problem. If you’re stocking wet food, favor smaller cans your pet can finish in one sitting over large cans that create leftovers with nowhere cold to go.
Practical takeaway: build the bulk of your emergency reserve around dry food for its shelf life and portability, and layer in a smaller reserve of shelf-stable canned food as backup or for pets who need the extra moisture or palatability. Don’t build a plan around wet food alone. If you’re weighing a third format, our freeze-dried vs. canned vs. kibble comparison breaks down the shelf-life and weight tradeoffs many go-bags overlook.
How to Store Pet Food So It’s Actually Usable When You Need It
The FDA’s storage guidance for pet food is specific and worth following exactly:
- Keep dry food and unopened canned food below 80°F, in a cool, dry place, not a hot garage or a car trunk.
- If you move kibble into a storage bin, put the whole original bag inside the container rather than pouring it loose. This keeps the UPC code, lot number, and best-by date with the food, so you can actually track what you’re storing and when it expires.
- Use a clean, dry container with a snug-fitting lid. An airtight seal keeps out both moisture and pests.
- Refrigerate opened canned or pouched food at 40°F or below, and plan to use it within a few days.
For water, the CDC’s general emergency-water-storage guidance applies directly to a pet’s water reserve too:
- Store water in food-grade containers, not containers that previously held anything else.
- Keep water storage between 50-70°F, away from direct sunlight and away from household chemicals.
- Rotate stored water every 6 months.
Rotation: Keeping the Supply From Going Stale
One authority does attach an interval to pet food, and it is stricter than most kits get rotated. The ASPCA’s disaster-preparedness page publishes its food line as “7-10 days’ worth of canned (pop-top) or dry food (be sure to rotate every two months)”, and it applies the same two-month clock to the water line, “At least seven days’ worth of bottled water for each person and pet (store in a cool, dry place and replace every two months)”. The same page states the principle behind both: food and medications “need to be rotated out of your emergency kit” or they may go bad or become useless.
The CDC’s cadence for stored water is longer, six months, and it is written for a general household supply rather than a pet kit. We are showing you both rather than averaging them into a number nobody published. Beyond the ASPCA’s two months, no other named authority we checked publishes a pet-food rotation interval, and we are not going to invent one to fill that space.
What you can hang a schedule on:
- Food and bottled water in a pet kit: every 2 months, per the ASPCA. This is the shortest published cadence and the one to follow if the supply is specifically the animals’.
- General household stored water: rotate every 6 months, per the CDC. Tie it to something memorable, like the twice-yearly clock changes.
- Dry food, once opened: most secondary sources suggest using within 4-6 weeks for best quality, so an opened bag shouldn’t sit in daily use for months even if the unopened backup stock is fine.
- Check best-by dates at the same time you rotate water. A single semi-annual check-in for both keeps this from becoming a task you forget about until the food’s already stale.
Vet-Wins Reminder: When Food and Water Access Becomes a Medical Issue
Storage and rotation are preparedness tasks, but a pet that stops eating or drinking during or after an emergency is a medical question, not a supply question. Per the AVMA’s named list of animal emergencies requiring immediate veterinary consultation, refusal to drink for 24 hours or more and severe vomiting or diarrhea (two or more episodes in 24 hours) both warrant a call to your veterinarian at minimum. The AVMA’s broader standard: any concern about your pet’s health warrants, at minimum, a call to your veterinarian. Don’t wait it out on the theory that a well-stocked kit means the animal is automatically fine.
If a pet has ingested something during a chaotic evacuation and you’re not sure it’s safe, the ASPCA Animal Poison Control Center is available 24 hours a day, 365 days a year at (888) 426-4435 (a consultation fee may apply per the ASPCA’s own page).
How We Chose
These picks are built entirely from manufacturer-published specifications and the live Amazon product pages listed in each spec table’s source column, cross-referenced against the FDA’s and CDC’s storage guidance above. We did not test any of these containers or foods ourselves, and we say so plainly. Where a spec wasn’t independently verifiable from a manufacturer or live product page, we noted it as lower-confidence rather than presenting it as a locked fact. Full methodology at /review-methodology.
Once your food and water reserve is sorted, the next planning step is making sure the rest of the kit matches it: our DIY pet go-bag checklist covers everything else Ready.gov and the ASPCA recommend packing alongside food and water, and waterproof pet document kits covers keeping vaccination records and ownership proof dry and ready to grab alongside your supplies. If you’re planning for more than one animal, multi-pet go-bag math shows how to scale all of this per pet rather than guessing at a household total.