Step aside.
Canned foods can be as nutritious or even more nutritious than fresh, depending on how old the "fresh" stuff is and how good you are at selecting it.
Whatever.
Fact is, even if you are not a fan of the can, in a bind it can save you time.
Keep on hand the following in cans, just in case:
Corn
Beans
Tomatoes
Tomato Paste
Tomato Sauce
Pumpkin
Chiles
It will simplify your life.