We routinely buy white and whole wheat flour and rolled oats in 50 pound bags from a Mennonite store about 20 miles north of here, and right now we're around 1/3 to 1/2 a bag of each so we're all set for at least another month. We keep the bags in plastic garbage cans in the pantry so that any mice that get in the building can't get into the bags. My sister has milk goats so milk is not an issue, and we have a lot of canned and frozen vegetables, fruits and meat from last year's garden, pig and meat rabbits, so if we had to we could go a long time without going to the store, though we normally do go once a week or so. Sometimes being a troglodyte is not a bad thing, at least for the duration of a crisis.