One of my colleagues who lives up in the Boise Hills has been feeling a strong urge lately to live closer to the land and further off the grid, if only by buying a goat. I suggested that she start selling halal goat meat to the local Muslim population, such as it is. More seriously, I recommended the Foxfire anthologies --and much to my surprise, she'd never heard of them! There are twelve in the series now, so whether you want to churn your own butter or fix up some bear stew, that's the place to go. It came from the backwash of the '60s, but AFAIK it's still a good DIY resource.
If I was still living in earthquake country (Loma Prieta, 1989) I would still have a Sprint/Nextel phone with the latter's Direct Connect, which is half-duplex. Even if the infrastructure was totally shot, they'd still function directly as walkie-talkies.
I'm in no sense a survivalist, though. If the civil order collapsed I'd probably be standing in line with virtually everyone else. My 9mm Glock 17 wouldn't even come into play --I'm just a geek with a gun.
Still, it's a good idea to stock up one's larder, just in case.