IMHO, what you need to establish these days are two things:

a) A way to pay globally on the Internet. Bitcoin. Solved.

b) A local network of people that you trust and which can provide all the local services / stuff you need. In particular food.

I don't see Bitcoin particularly useful for local trades. Of course, it can be used - but it's not really what I'd want to use it for. There's networks for b) emerging in most places and there's nothing keeping you from creating one of your own. When things go well, it will have been a nice experience ... if things go really really bad (and it's not unlikely that bad stuff is going to happen in many locations), it'll be very helpful. Well, not in all cases ... I just thought of Fukushima as an example of how things can go "really really bad" - unfortunately, in that case your local network will be kind of useless because you have to change location. However, if there's a total financial collapse, or electricity breaks down on a large scale where you live, that kind of network *will* be helpful.

If you've done your homework with b), an "internetless world" will be inconvenient but you'll easily survive. If you haven't ... you're taking a risk ;-)