You don't want leftovers if you don't have refrigeration. Deciding What to Buy A lot of recipes call for egg noodles. Egg noodles take up a lot of space compared to plain spaghetti. A box cake takes up more room than the equivalent amount of flour. Try to purchase items that don't take up a lot of room.
Price Canned food and packaged food varies enormously in price.
Warehouse stores give great values on just about everything. But you can actually do better if you watch the sales. My rule of thumb is that if a can of vegetables or beans that I need is less than 50 cents I buy it. Sometimes you can get them for 4 for a dollar. I look for half price sales.