Everyone believes that the convenience of being able to simply go to their local grocery store to pick up their food will never go away. But what the do not realize is how intricate the food supply system actually is, and therefore how delicate and suseptible to interruption it is.
Grocery stores in your cities and neighborhoods have plenty of foods on their shelves because of one reason, they constantly receive resupply shipments many times a week if not on a daily basis.
Throughout the United States grocery stores typically hold about 3-days worth of food. If they are not resupplied, within 3-days their shelves are bare. Here in Hawaii, a typical grocery store will go bare within 2-days without resupply shipments.