We have a private well, so no issues there. If the power goes out, we have a generator, and 15 gallons of gasoline in reserve. Food is another issue. Maybe a week, then it's time to get the turkey call out, and I'm not that good of a shot.
I'm British so I have an endless supply of beans, we could probably live for months on those. We only drink bottled water plus all the fruit juice, cans of soda and beer we could probably make it for a month.