That's true but how much can you enjoy a trip where every penny must be carefully watched. Poverty and privation are poor traveling companions.
I think Russell was a bit harsh but his overall concept is valid. You don't need huge resources or lavish accommodations but you do need enough money to more than barely get by. you need to eat adequately, sleep in a safe place and be prepared for unexpected expenses and bike repairs.
Also, as a woman, do you really want to sleep by the road side with no other shelter? Face reality, that's not a safe or intelligent plan.
Finally, the vegan diet doesn't strike me as an attractive option either but it's your choice. Just be careful to get a well balanced meals as your riding will be very demanding on your nutrition. It's difficult to get all of the proteins you need on that diet unless you choose very wisely and that won't be the cheapest food available.