I was going to also suggest Into the Wild by Krakauer.
You can't get many calories from grazing leafy greens, wild food harvests are very variable, and you'll use a lot of energy spending all your time on food and shelter. Unless your supplies will include barrels of rice, beans, and cooking fat. And vitamins.
I understand the lure, (started with My Side of the Mountain by Jean Craighead George) but just isn't an easy proposition.
