Getting back to a $15K budget for a single person, this is the budget for the guy we talked about here before that lives out of his RV.
http://vagabonders-supreme.net/BudgetInfo.htm
Even his budget is over $21K, and he spends under $5 a day on groceries.
AVERAGE MONTHLY INCOME:
Social Security: $1,049
Google AdSense & Affiliate Ads: $770
Donations: $99
Average Monthly Total Income: $1,918
AVERAGE MONTHLY EXPENSES:
Auto Fuel & Tolls: $370
RV repairs by mechanics: $388
MsTioga parts, oil, tires, improvements: $190
Groceries: $146
Dining Out: $46
Insurance: $78
Medicare health insurance: $75
Internet related expenses: $223
TV & Satellite Radio: $36
Cell Phone: $42
Propane: $39
Misc. Expenses: $149
Average Monthly Total Expenses: $1,782
Average Monthly Net Income (savings): $136