Daniel Suelo has been living without money since 2000. As he states:
I’ve been totally without cents since Autumn of 2000 (except for 1 month in 2001). I don’t use or accept money or conscious barter – don’t take food stamps or other government dole.
You can read about it here. It’s an interesting story, but he basically lives in Moab, Utah and he basically lives in a cave:
My primary home is a cave in the desert canyon near Moab, Utah. The latest cave I’ve been staying in is maybe 5 feet wide and 5 feet tall inside and 15 feet back. It has a tear-drop shaped opening, part of a crevice in a cliff wall. I cover it with plastic in the winter & it stays fairly warm even without fire. But I built a little wood heating & cooking stove out of a large tin, with connected cans as a flew, which takes the smoke out a small hole conveniently above the entrance. Just a couple small sticks will cook a meal & make the cave warm & toasty. The cave is very stealth, hard to find, & doesn’t even look like a cave even when you’re close by. The entrance is south-facing, high on a ledge, meaning it gets sun most days in the winter. I can sunbathe naked up there in the dead of winter while the temperatures are frigid in the canyon below as well as in town!