If TSHTF for real we're all dead. What you want to prepare IMO for is short to medium-term disruptions, such as occur all over the rest of the world and we make fun of when we travel to other countries.
Utilities that go out for days or a week, and only work for a couple hours a day when they come on. Supermarkets that can't get any food for some time. The garbage workers and snowplow drivers go on strike and nothing gets picked up or plowed for a month. No water comes out of the tap, and when it does it's not drinkable.
Basically, what's the worst case in which civilization still survives at all? Probably about a month of chaos. After that the lights are never coming back on and you might as well go CHUD. So plan to feed, clothe, and heat your family for that month.
My opinion.