A backpack with a blanket, a change of clothes, water, a few protein bars, a flashlight, lighter, and a good multitool wouldn't cost much to assemble, takes up little room, and when kept by the door could be grabbed on the way out, another could be assembled and kept in the car. If there is a flood, fire, earthquake, ect that is enough to hold you over atleast for a day until you can get yourself back together and can figure out your next course of action. For me that is reasonable, even if you never have to use it.