There would be a lot of practical problems to long-term wilderness squatting. The only person I ever met who did it successfully had a lot of skills and support. He lived in a cave on Skye, Scotland. He lived by a mixture of working as a canoe instructor in summer, sea fishing and occasional carpentry work. It worked out because the owner of the land where the cave stood liked him (both were ex-military) and did not throw him out or demand rent, because local people liked him and picked him ahead of others for work and for buying fish, because he was a very good canoeist and sea fisherman and because Scotland has the NHS which provides free health care.
How about joining a Buddhist community, where it might be easier to live the sort of life you seem to prefer? But don't follow the example of a woman I knew who joined one: despite being in her late 60's when she joined a Buddhist community in Brighton, England, she was thrown out for "corrupting" (i.e. seducing into her bed) a monk of about a third her age.