Futurology

3 days worth of food is like bugger all. Worst case I could survive 3 days on just a case of beer.

Otherwise; first day most of the stuff in the fridge is still fine, second and third day there are probably some cans of tuna and such in the cupboard. Hydration is the biggest issue, but most people probably have some beer, wine, soda, or bottled water in stock anyway.