Boneless, skinless chicken pieces (in freezer)
Canned beans
Cheese (feta, Parmesan, blue: these keep a long time)
Chicken or vegetable broth (in aseptic boxes, or homemade and frozen)
Frozen berries
Marinara sauce: a great carrier for leftover vegetables or meats
Frozen vegetables (peas, corn, squash)
Garlic and onions
Nuts
Olive oil
Pasta
Rice
Vinegars of various types
Wine: cheap white and red