Illinois Extension’s emergency food supply guidance gives the clearest number: maintain a food supply that can support each household member for 14 to 30 days, plus one gallon of water per person per day. University of Minnesota Extension builds its whole plan around two weeks and suggests aiming for at least one well-balanced meal per person per day.
Two weeks per person. That’s the answer, and it is a lot less dramatic than the internet would have you believe.
Where do you start?
By counting what’s already there. UMN’s first instruction is to take inventory before you shop, and it notes you may find you already have a two-week supply of most staples sitting in your cupboards.
Its written plan is four steps: list everyone in the household including any special dietary needs, list the staples on your shelves now, list what’s in the freezer, then map out meals for 14 days. Illinois Extension’s version is to build the supply by increasing the amount of staple and non-perishable foods you already keep, rather than buying a separate stockpile of food nobody in your house likes.
That second point is the one that saves money. Food storage you don’t eat is not storage. It’s a shelf of expensive regret.
What should you buy for food storage?
Illinois Extension’s list is organized by food group, which is more useful than a list of products:
- Protein. Canned meats and fish, dried or canned beans, peas and lentils, nut butter, nuts and seeds, eggs, fresh meat and fish that can be frozen.
- Grains. Rice and pasta, cereal and oats, tortillas, flour, baking mixes, popcorn.
- Vegetables. Canned, frozen, and the longer-keeping fresh ones: beets, carrots, onions, potatoes, winter squash.
- Fruit. Canned in juice, dried, frozen, plus longer-lived fresh fruit like apples and citrus.
- Dairy. Shelf-stable milk, aseptic or powdered, plus cheese and yogurt.
- Everything else. Canned soup and broth, dried herbs and spices, bottled water, pet food, infant formula if needed, and a manual can opener.
That last item is not a joke. Illinois lists it twice.
What does the cheap base of that shelf cost?
Here’s where our own price work is more useful than a generic list. These are the highest protein-per-dollar shelf-stable foods in our July 2026 sample, with the package we actually priced.
| Food | Package | Price | Protein per $1 |
|---|---|---|---|
| Pinto beans (dry) | 4 lb bag | $3.97 | 97.9 g |
| Whole wheat flour | 5 lb bag | $3.12 | 96.0 g |
| Brown lentils (dry) | 16 oz bag | $1.44 | 77.7 g |
| Peanut butter | 40 oz jar | $4.97 | 50.7 g |
| White rice (long grain, dry) | 5 lb bag | $3.37 | 48.0 g |
| Old-fashioned rolled oats | 42 oz canister | $3.36 | 46.6 g |
| Canned black beans | 15.5 oz can | $0.88 | 30.1 g |
| Canned tuna (chunk light, in water) | 5 oz can | $0.98 | 22.4 g |
Source: USDA FoodData Central nutrient values plus single-store US prices, July 2026. Full methodology at /methodology/.
One package of each comes to $22.09. That is not a two-week menu by itself, and I’m not going to pretend it is. It’s the protein and calorie floor that the extension menus build on top of, and it costs less than one delivery order. The full ranking is in cheap shelf-stable protein.
How long will it keep?
Long enough that the buying is the hard part, not the storing. USDA’s shelf-stable food chart gives low-acid canned goods, meaning beans, corn, carrots, peas, meat and soups, 2 to 5 years on the shelf. High-acid canned goods like tomatoes, fruit and juices get 12 to 18 months. Rice and dried pasta get 2 years.
Dried beans are the outlier, and the range is wide. MSU Extension and Utah State Extension both put beans in their original food-grade bag at about a year, and beans sealed in #10 cans or Mylar bags with the oxygen removed at 10 or more years. We broke that down in how long dried beans last.
How do you stop it rotting in place?
Rotation, dates, and a room that isn’t the garage.
Illinois Extension recommends keeping non-perishable items in a cool dry location between 50 and 70 degrees, away from sunlight, damp areas, vents, pipes and furnaces, and dating items with a marker so you can see what to use first. USDA’s own storage guidance is to keep canned foods below 85F and warns that over 100F is actively harmful.
The habit that makes all of it work is boring: shop from the shelf, restock the shelf. Oldest at the front. If you never eat from it, the whole thing quietly expires while you feel prepared.
For the temperatures behind all of this, food storage temperature rules has the numbers. For the pantry cans specifically, how long canned beans last after the best by date covers what the date does and does not mean. And if the goal is a cheaper grocery bill rather than an emergency shelf, how to grocery shop for a month is the more useful read.
