Most fresh fruits and vegetables are bought by the pound, so getting a week's worth or less is not that hard. Exceptions: lettuce is the big one; even when buying a bag I'm pitching a fair amount in the end. Watermelon's the other. If I have to buy mushrooms in bulk, they'll freeze ok. Onions and fresh herbs might be a problem so I just use the dehydrated / powdered.

Other than that the only thing is having to refrigerate the bread and buns.