I tend to buy things for a specific recipe and because I live alone and have weird food preferences when I make it I tend to have like 6 meals worth and will eat that 2x a day with something else as a third eat-time usually for some variety so it doesn't go bad.

So I might buy a package of veggie beef substitute or chicken, beans, diced tomatoes, peppers, corn, onions, etc. and use other spices to make chili, but this usually ends up with me eating chili twice a day for a week. I could create less I guess and save like half the can of beans/tomatoes/package of veggie meat or the chicken, but then I'd have to figure something else that uses those AND cook that before they go bad too now that I've opened them anyway.

Most recent thing I did that with was a yogurt combo with greek vanilla yogurt, rolled oats, cherries, and a little bit of jell-o cheesecake mix, (I think I even added a little bit of vanilla instant breakfast too) but all those came in resealable containers (except the cheesecake mix which I ended up saving the rest in a plastic bag, that's not really going to go sour and stink up the place in 3 days) so I ended up only making four servings so that's what I've had the past two days (well, not today today, it's 4:30am and I haven't eaten, but today I'm going to make salmon and mango chili salad so I'll probably have at least 4 meals of that made by 1pm that will be lunch/dinner and at least one of tomorrow's meals.)

So I kinda just think of a recipe like that and eat a lot and move on to the next. The vegetarian chili is probably a favorite though, but I don't have the kitchen/fridge/freezer space in my studio with like two feet of counter space, two cabinets that can't fit anything larger than the smallest bottle of vinegar on the shelves, half a stove, no oven, and a mini compact fridge/freezer to really make it the way I want now.