I'm not an authority on these sort of things, but here are some suggestions on things to do to prepare for hurricanes and such. Everyone else please throw in your ideas and make any corrections.
-If your normal tap water is all right, you can fill up jugs and old soda bottles to keep in your refrigerator rather than rushing out to buy jugs of bottled water.
-Rather than getting bag ice, fill up 16 ounce soda bottles and freeze them. They'll last longer than bag ice and keep your freezer contents cold.
-Have lots of batteries and flashlights/lanterns available. Do NOT depend on candles or anything that requires fire after a tornado or hurricane if you have gas lines nearby. There could be gas leaks and having an open flame wouldn't be a good thing.
-Before the storm, turn your refrigerator to its coldest setting in case you lose power for a while.
-A corded phone in case you lose power. Your cordless phones won't work.
-
Battery operated fans! This is a big one if you lose power in the South during the summer. It will at least keep the air moving.
-Have battery operated games (Gameboys and such), coloring books, etc. to keep kids occupied.
-Battery operated clocks and radios to keep track of the storm and in case your power is out for days and you still have to get up to go to work. A weather radio is a good idea so you can get advance warnings on tornadoes. (Though the weather station here got blown out with the hurricane.)
Generators:
-Do not hook it up directly to the house UNLESS you have had an electrician set up a specific breaker so you can disconnect from the external power connection. Otherwise you might end up putting feedback on the power lines and harming the electric workers as they repair your lines.
-Be sure to have your generator in a location where it isn't in an enclosed space. Running it is just like running your car, so if you had it in your garage with the door closed, you'll risk carbon monoxide poisoning.
Here's our County's site that has links to information for preparation.
http://www.alachua-em.org/