Good luck!
If you are going to shop, how many places do you think you can hit before your currency doesn’t have enough denominations?
My bet is the average thief/looter might be able to hit 3 places before he takes a dirt nap.
Time-wise, that’s what? Two weeks, maybe?
Stockpilers are completely invested in the “I have to stay here” mentality and that will be their downfall. The most mobile will be the survivors. They can adapt.
You have to be Switzerland to hold out for long period of time.