Learn where the closest not-your-tap water source is (even if that means how to make/use a solar still or cut the head off a barrel cactus), ten edible plants in your area, and three ways to make fire. Get some extra canned foods when you go to the store, or if you have the money, buy the things you eat in bulk.
(I have found this article so very helpful in understanding this last concept)
Start. A. Food. Garden. Now!
Growing food over the winter is really easy (all it takes is some cold-loving seeds, some dirt, and a few layers of row covers (with plastic on top if it gets really cold out, like below 10F), and may save your life. Growing food in the summer is even easier, depending on your climate. But it does take some practice to learn organic methods (which when chemical fertilizers go bye-bye, will be what you're left with).
You do not need to till or break anything, including your back. Cut the weeds back and use them for mulch. Start a compost pile, or dig holes in your garden and put kitchen scraps in them, then cover with dirt or cut weeds. You will need some water, or you can water them with pee.
The main thing is to get started. All the preps available won't help you if you don't do something.
So here's what you do:
Make a list of the ten things that scare you most about peak oil. Pick the things that are putting you into panic mode.
Figure out three things you can do about each one of them. Get creative.
Now you have a list of thirty things you can do. Pick one. Do it.
You'll feel right as rain.









