If you had canning gear, you could can pork loin which is always inexpensive, then even if you had no power, you would have canned inexpensive meat that was vatly superior to spam.

This means you could grow tomatoes and can them as well.

If you have pinto beans, canned corn, flour and baking powder to make tortillas, some blocks of Velveeta cheese, some homemade salsa from those tomatoes, one's family can live on that. It is nutritionally complete and doesn't taste bad.

You could can fruits as they come in your garden and from your trees and in trade from your neighbors.

A lawn is utterly useless versus a garden with vegetables, herbs, and fruit. This next decade will be very difficult to get through otherwise.

A smart person with a hand grinder could mill flour and corn meal. And they are not expensive. If you had a meat grinder, you could make hamburger that is higher in quality plus sausage and you control the fat content.