The way I figure it, the chances of there being a survivable large-scale catastrophe that would keep us away from utilities and the grocery store for more than two weeks are pretty darn remote. It's not something I worry about.

I'm well-prepared for two weeks, and if we could find a source of water that wasn't contaminated we'd be okay for about a month. I figure that with some financial and storage sacrifices we could probably extend that period to two or three months but beyond that we'd really need to move.

For us it would require a huge shift in lifestyle: we'd have to move to a rural area, buy or build a house with quite a bit more storage than we have now, and either store a lot of food and water or have it available from natural resources. I'd have to find a new line of work.