I have heard of this great book (never did read it though) called "Naked into the wilderness" IIRC, Chris K was recommending it recently to someone who wanted to run away from civilization (or his parents - wasn't clear which) .

In anycase remember that humans developed tools and refined them in order to make it possible then easier then comfortable to be the top predators in a very tough food chain. neglecting to take advantage of several millenia of development is not something that I would do on a whim. With proper backup to pull me out if I fail I might want to make the experiment to see how it was to be a truely primitive man but to do this as a way of life or even as the preferred mode of camping seems folly to me. I don't want to think of facing a storm in the wilderness without something waterproof other than my skin; much less a do I want to face a bear.