There are too many people that live their lives like a lot of manufacturers today. They live by the just in time supply matrix. Never buy extra, never have much on hand. That is more or less how my first wife kept the house, nothing on hand. My current wife and I beleive in being prepared which includes food, hygiene supplies, medicine, firearms, and a way to keep warm.
5 days is a nice start, but I think 6 months is a better minimum.
There are two kinds of people, those that are prepared, and those that suffer.