Food - Steady diet of beans, pasta, or rice?
Shelter - Tent or house?
Medical expenses - What's basic?
I've survived in tents and on limited rations (for a limited time) while in the Army. Big tent, pot bellied stove, and MREs in Jan-Feb in Minn/Wis. Same tent, and C-rats while in Germany (no stove).
There has to be an accepted standard of living before a survival income can be established. Once a standard of living is defined, then the income could be adjusted based on locale.