[BearCub]

The prudent "survivor" will have the holy trinity - guns, food and water

You forgot currency: Ammunition, tobacco and alcohol. With those, you can barter for anything else you need.

[ozarkgirl]

You forgot currency: Ammunition, tobacco and alcohol.

And gasoline will be a precious commodity. Read "Patriots" by John Wesley Rawles. Fascinating book if you can make it past the 2nd chapter (boring 1st 2 chapters).