Here are my assumptions:
- camping/lodging: $300 (Minnesota State Park campgrounds are $20/night, assume free-camp half-time)
- food: $300
- health/insurance premium: $100
- transportation: $30 (not-by-bicycle)
- stove fuel (gasoline): $5.00 (1 gallon)
- miscellaneous: $30
This gives me a monthly total of $765, for a daily average of $25.50.
I’ve based these figures on local prices and my own expenses over the last two years. Applying a little geoarbitrage (traveling through countries with cheaper prices) would help bring this down substantially, allowing meals in restaurants and hotels instead of camping, and also freeing up money for other expenses like travel visas and the repairing/replacing equipment.