I say 7 for us. We have a years supply of canned chicken, plus our live flock that produces chicks constantly. They free range, so egg production will drop if no supplement feed, but should be plenty. We have a pond and a way to purify the water. More ammo and guns than I need. We already kill and process almost all our meat anyways at this point. We have antibiotics on hand and have planted many medicinal plants and trees. Unless the wild pigs are hunted to extinction we should get a chance to get one here and there.