That has already been done, kindasorta. Read 'Worldwalk' by Steven M. Newman, in about 1983. His trip started out as a backpacking/survival/live off the land kind of thing, but that only lasted a couple of days. Did the entire trip mainly living and eating with locals who gave him food, shelter, etc. It was still interesting readying tho. His closest brush with death, surprisingly, was in Australia...