Step 1: Buy canned food and shelf stable dry food , like rice and pasta.
Step 2: Arrange food on a shelf with the soonest expiring items to the front.
Step 3: As food nears expiration, donate it to your local food bank. Replace donated items and place new cans in the back.
step 4: Lather. Rinse. Repeat.
You will economically provide an emergency food supply for your family , and you will be feeding the poor in your neighborhood for free.
Proverbs 19:17 Whoever is generous to the poor lends to the LORD, and he will repay him for his deed. Whoever is generous to the poor lends to the LORD, and he will repay him for his deed.