If we are overdue for a shop and have no food in, I use my store cupboard.
As a prepper, who has been shielding and lives in the sticks, I always have in lentils, yellow split peas, tins of tomatoes, tuna, anchovies, sardines, and a variety of frozen vegetables and herbs from the garden, as well as lazy garlic, onion powder, chilli, pesto, curry things, flours, oils etc. A sacka spuds, dried pasta, rice. Catering cartons of cheese and white sauce, and soups.
Then I look at any left overs and the manky vegetables left in the fridge.
From these, I can generally throw together something.
I think my favourite is dhal, DH likes a tuna pasta bake, or maccy cheese.
Years ago, when squatting with a bunch of hippies, with no store cupboard, it would be a one pot meal, brown rice, with lentils and any vegetables we could pick up off the street after the market, and stir through tins of vegetables, and whatever would give some flavour.
When we were living on a protest site, we would go “skip shopping” and grab the day old stuff the supermarkets chucked out. It made for some interesting meals... 🙂
At its most basic, we would make “Frasers” in pans on the camp fire, which was just self raising flour and water, which would rise into a sort of bread, only edible when warm.