I am sort of a survivalist. I'm not the stockpiling stuff in a bunker type though, but the type seeking to be able to sustain a lifestyle in the absence of supermarkets, drugstores, etc...
Well, if there are no stores you can't buy disposable razors, or replaceable blades. With a couple of straights and a set of hones you are good to go.

Since getting into straight razor shaving though, I've gotten a bad case of ERTSSAD (Everything related to straight shaving acquisition disorder). I love the feel of the shave, the relaxation of the prep, and the way my skin feels after the shave. There is absolutely no way I'd ever go back to disposable or cartridge razors.