I don't think we'd die if we didn't have something in the house. There is usually a substitute or something else we could make do with. I make sure I don't run out of any the animals food though since they don't really have alternatives.
TP & deoderant, I ALWAYS have back-ups of both!!
I've run out of toilet paper and couldn't go to the store until the next day. Kleenex worked just fine. The kids freak out if we are out of milk, bananas, or yogurt.
Coffee & Coffee Creamer
Coffee, toilet paper and feminine products.