Sometimes this happens after a snowstorm - or some other natural disaster. Sometimes this happens when you run out of cash for various reasons. Anyway, how do you cope - especially if food supplies are low? Well, it's always good to have some peanut butter or something to tide you over - and especially, try to work and not think about food, lol.
Anyway, there was this huge storm where I live in 1993. The power was out for a week I think. That was probably the worst situation I had dealt with. Well, I was trapped at home for two weeks once I think - but the power didn't go out - or it didn't go out very long.