Have you actually tried doing that? It can be challenging to say the least.

I do it for fun sometimes, but I do it fully provisioned and knowing I can always decide to bail, hike out, and go home to my nice warm bed, clean hot and cold running water (people don't realize how huge this is), a fridge full of food that I don't have to carry with me, devices to make the food within minutes on a whim, no bugs or potentially dangerous wild animals, etc.