Low budget travel destinations?

Hey, 

Im planning to go traveling on a very low budget. My aim would be to learn more about spirituality, healthy foods, meditation, yoga etc.. Will also be using couchsurfing, workaway, wwoof etc…

Where in the world can you get by with the least ammount of cash ? 

Probably somwhere in South America or Asia. 

Also i have heard that there is a big hippie commune in Spain mountains.