We keep an emergency "go bag" in the front hall closet with tools necessary for basic survival. Included in that are 6 weeks worth of MREs for the family, water filtration system, water storage (fill it in a tub), rope, shovel, saw, first-aid kits, blankets, and so on.
Whatever the situation may be, whether natural, political, or zombie-related, we can grab that and hit the road knowing we have the basics.