I'm not a big apocolypse person, but lived in high hurricane threat areas for goodly portions of my life (Hawaii and Florida).
I always have a fully stocked pantry and my freezer is fully stocked. Always is, always has been. You could live out of my house for easily a month. (Must be that injection of LDS I got as a kid!).
When I did live in Hawaii and Florida, I'd stockpile plastic bottles, fill with water, and freeze so that my freezers were completely full of ice. The longest I've had to go without power was the better part of a week. As for water, only a couple of days. Having that ice in the freezer keeps your food frozen much longer, and the source of water is a comfort. If your freezer isn't full and you get the notice that the big one is going to hit, then fill the freezer with as much newspaper as you can. It is a great insulator.
Usually you know when all hades is about to break out. When the warning comes, scrub all your tubs and sinks with a clorine-based product. When it goes from Watch to Warning, fill them all with water. I hope you all know that you can do what I call a "gravity flush" of your toilet with a bucket of water. Even if you don't use this water for drinking, having a way to flush your toilet, wash your face, etc, is really nice.
Having all that extra food is NOT a waste. Periodically I scour the pantry, fill up a couple of bags, and hit the local food bank. I think I keep so much food on hand because I simply come from a large-ish family and am used to being able to feed a crowd at the drop of a hat. When something has been sitting on the shelf too long, it just goes to the food bank (we're talking non-perishables here).
When the electricity goes, you get together with your neighbors and decide who has what in their freezer that needs to be eaten tout suite. Then you fire up the barbie and have a neighborhood nosh. Charcoal, lighter, and gas grills are literally lifesavers in emergencies. But remember that life is a little easier if you, as the old song goes, "get by with a little help of your friends."
PLEASE don't forget to keep a radio that works on batteries and an extra set or two of the batteries. Being at home alone in the dark without any news is pretty creepy.
Please have at least one telephone in your house that is old fashioned -- a cord, plugged into the wall, no electrical outlet. Sometimes these phones won't ring if someone calls you, but you can call out on them in an emergency.
When it is all over with, take any meat from the freezer that has thawed and make chili, soup, stew, then re-freeze (this is assuming it is still cold and safe to eat).
