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