@TeeDee......every family is different.
Fresh food, a week or so.
Veggies like pototoes and carrots though will last for months if properly stored in winter. I used bags of peat in a garden bench outside. My Winter store of root veggies will last four months.
Dried foods, from broth mix to flour, I have at least six months supply. Because of the range of stuff I use and store, it'd probably last a lot longer if push came to shove.
Tinned foods, like Nido, I have and will keep for years, but if we needed to use them and only them, I have a month's supply.
I do buy cans; meat I buy for Himself, only stuff he actually likes, in cans and stash because it's practical but most meat for Himself comes from a friend who hunts. This week was a venison pie and pigeon breast burgers. Not everyone has that option though, so again, you need to think about what you'll actually use. Multi use options preferred....corned beef makes hash, or fritters, or stew, or curry, or chilli, for instance. Tinned ham makes sandwiches, a base for soup or strew, battered pork stuff, stir fry or sliced thick and cooked like gammon steaks with pineapple....or sliced thin and it'll fry up like bacon with eggs.
Chicken in white sauce makes creamed chicken, stuffs pastry, makes curry.....that kind of multi use if you have to use cans.
Home canned foods are done in season, there's a years supply, and a little extra, of those at the time I make them.
Sometimes I buy extra when I see it on special (citrus fruits at Christmas time for instance or special offers on fruits in the supermarkets, fruit leather lasts really well, and is an excellent munchy at any time of year, but canned apples, rhubarb, and peaches are great for pies, tarts and puddings. A sack of carrots is a gold mine
A week's food in hand is a picnic and woefully underprepared for any emergency.....but that's
my family, not yours, iimmc ?