Once you have the essentials, you can begin to gather supplemental items that will make a disaster just a little less horrifying.
Lightsticks - These glowing green sticks, generally work for up to 12 hours and shine underwater.
Signal Flares - These are certainly the most helpful item you can have if ever you find yourself in a rescue situation.
Tools - Consider any of the particular dangers of your house when packing tools. You'll probably want to store a valve wrench to turn off your gas main. It's also a good idea to store a Swiss Army Knife or a multi-purpose tool like a Leatherman.
Radio (with batteries) - Think of all the trouble the Professor on Gilligan’s Island had with that makeshift radio. What he wouldn’t have done for the real deal with batteries (long life, so you won't have to replace them frequently).
Consider Sanitation
Imagine living without running water for days on end. Ok, so you can see how important it is to have a make-shift toilet and accompanying supplies to keep things clean.
Anti-Bacterial Hand Sanitizer - This product comes in bottles or in moist wipes. Throw both of them in the kit if you can.
Toilet Bags - These are used to line your toilet bucket. They can be purchased at any camping supply store. If you can find them, pack trash can liners. They’ll work just fine.
Toilet Chemicals - RV manufacturers supply chemicals to sanitize toilets without running water. Pick up a few packets of dry chemicals to keep things clean.
Other Sanitary Supplies - Don’t forget the toilet paper, feminine hygiene supplies, and locking plastic bags (which come in handy for garbage disposal).
For Spot and Fluffy
Don’t forget the dog or cat. They’ll need food too. So, pack a few provisions for the four legged members of your family. Throw in some canned food or foil-packed food for them.