Before you even go to the store, check out your pantry. Chances are you can find enough of the staples to make a few meals if you buy some protein and veggies to go with it. See how much of those dry pantry goods you can use in meals each week. Each item that you already have is something you won't have to buy. The same goes for the fridge and freezer. You'll want to use up frozen goods before they become freezer burned. So don't forget about that package of chicken breasts you froze when it was on sale at the grocery store. And if you can keep your fridge and pantry organized and well-edited, you'll have a better chance of using up what you have.