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 |
“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, and 5 to 7 days is where the ASPCA and Humane World land once you move past the bare minimum. If your storage space allows it, build toward the 5-7 day end rather than stopping at FEMA’s minimum. 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, repeated across many veterinary-adjacent sources, is roughly 1 ounce of water per pound of body weight per day. We’re flagging this clearly: it’s a widely corroborated figure, but we weren’t able to independently confirm the exact wording on a single ASPCA primary page during this research pass, so treat it as a solid planning estimate rather than a locked spec.
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) |
Cats generally need less in absolute terms given their smaller size, but the same per-pound logic applies: scale down from the dog figures above using your cat’s actual weight, not a flat “cats need less” assumption. 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.
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.
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
The ASPCA is direct about the underlying principle: food and medication in an emergency kit need to be rotated regularly to avoid spoilage or expiration. What none of the named authorities publish is an exact pet-food-specific rotation interval. That’s a real gap in the sourcing, and we’re not going to invent a number to fill it.
What you can hang a schedule on:
- 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.