I have long been a believer in the small, guardable, community. Bug out by yourself ..or a wife and child..How do you provide protection 24/7 and still hunt, trap and forage, say nothing about sleep? Here in the small hamlet where I live, we could perhaps cordon off an area for 20 families, pool resources and do other tasks while being on guard 24/7. Some of our hamlet has a local water system..while oyhers still have their well systems.. many of which would work fine simply by placing a pitcher pump on them.
Most here are hunters (with plenty of guns and ammo) and some trappers & gardeners, along with some experienced combat veterans...they also include a few EMTs and nurses.. no doctors, but 3 veterinarians, whose skills could be useful.
When an emergency arises a bugout by highway is not a good plan.. Just last week, those who hunkered in place seem to have fared better than those who hoped to "drive out". Those guys got caught in a traffic snarl, and faced the tornadoes in the open.
Here's an interesting novel concerning a time when the whole country is hammered by EMP (electro magnetic pulse) bombs, which fried all computers.. The hero of the novel led a "community " effort:
http://en.wikipedia.org/wiki/One_Second_After There is a movie also..
The book is available through Amazon, for one:
http://www.amazon.com/dp/0765356864 A good read for anyone considering SHTF scenarios..