I have a few things, mostly for camping though. Propane stove, a few ice chests, propane lantern, I have a lot of candles, we always have enough food in the house to get us through at least a week, being well fed and enjoying our meals- we could potentially stretch it to a month, but it would not be pleasant in the least bit. I also have a pretty big solar panel, and a deep cycle battery to keep all of my electronics charged up if we were to lose electricity. Alternatively, I own a Chevy Volt, so if gas prices go astronomical I will be able to get by on electricity alone. I'm currently getting about 600 miles per gallon, with no added electricity to my monthly bill - so I'm already saving a lot. If gas gets back up to $5.00 a gallon, I will be saving a small fortune.
We are pretty well situated in the event that things went bad for a week or two.
If shtf, I would not want to live in that world. Nuclear strikes, a massive plague, something that decimates society as a whole, no thank you. As the such, I don't plan for a major catastrophe.