Camping out my not be such a bad idea. The zombies are pretty much in the cities since that's where they died. They don't drive so they can't cover lots of ground quickly.
By camping in the woods they are putting themselves outside the usual area the zombies are in but inside the area that can provide water and wild game. Plus they appear to have few firearms and ammo. Defending a building may be less of an option than simply taking flight if large numbers of zombies start showing up.
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