Touring on 20 dollars a day is doable. You do have to think about the fact you may not want to, and exchange dollars for comfort. As some of us older folks will tell you, your back will thank you. As a kid I used to sleep on overnight trains crossing Europe. No more. The stiff neck is not worth it. Be creative, like using hostels and other inexpensive places to have a bed for rest days and not try to go 15 days straight sleeping on the ground. Just my 2 cents.