Like many people have said: freezer.

We have a box of quart-sizes freezer zip bags. Whenever you make food, immediately separate half of what you made and freeze it. You can always thaw it later when you don’t have time or energy to prepare food.

Dairy tends not to freeze well. Most other foods do. You can freeze pasta, rice, and bread easily, so make a bunch to mix in to future dishes, and if you can’t get through a full loaf of bread before it spoils, freeze half the loaf as soon as you bring it home.

There are a lot of meal prep tips websites, and it sounds like you are inadvertently meal-prepping. See what tips they have for storing food.