Reply #2: I seriously doubt that just ONE book could possibly cover

[Speck Tater]

"everything" you need to know to live off the land.

Are you talking about long-term subsistence farming, or hunter-gatherer, living on grubs and termites and dandelion greens? In either case, that information would be VERY specific to each geographic area. How to survive in Greenland will be a very different task than how to survive in the Australian outback, or the Amazon basin.

If you are talking about "country crafts" then try the Mother Earth News website. If you're talking about holding up in a fortified mountain cabin, try Survival Blog. If you're looking for general do-it-yourself, try My Web Page.

First find the specific community of people who are talking about the specific subjects you are interested in, and then ask THEM for their recommendations.