1. Don't eat fast food. It's bad for you with some minor exceptions.
2. Grocery store dumpsters are filled with perfectly good expired stuff.
3. Get good at cooking cheap stuff. Make a careful study of it.
4. Develop a portable career. There are lots: Ski lift operator, school teacher, fruit picker, construction, and many others.
This is not a complete list. Add it to what is posted aboe. Someone should get with Fred Becky and debrief him.
I built a camper out of an old farm truck when I was 19 and lived on the road for a year.