Have always had:
Ammo, lots and lots of ammo.
Good dog
duct tape, good for lots of things
more ammo
lots of food
keep track of the local mule deer herd (food source, that would be hard to tamper with)
lots of first aid and advanced life support stuff (I'm a medic, wifes an RN)
Only thing I'm worried about is how am I going to play AH if the power is out for weeks on end?