Also need a good water supply. We have our own well, with a double action hand pump backup should the electricity fail.
Finally...be prepared to take the necessary precations in the even of a fall-out patter coming near.
We have no bunker...iof a large one strikes too close, we are probably toast. But here in Idaho, that is less likely.
Almost anyone can take one degree or another of these precautions...and they are good for any emeregency.
Yeah, we know all that, being from the fifties era. A fallout shelter, even a blast shelter needn't be much at all. Some people want a fortified bunker, others are happy with a corner of the basement. Food for a year is very easy to provide, water is more of a problem. We'll probably emerge healthier without having consumed three times the calories that we really need.