There are a few things that I had in the house that really made getting through the Hurricane with the level of safety and comfort that we had possible. Most of this stuff, you probably already have:
A set of Black and Decker 20v tools. Since they all use the same battery, buying these tools meant that I had plenty of batteries on hand. Having a bettery operated chainsaw meant that I could save the fuel for use in the generator:
A Fluke Multimeter: The fact that it measures true RMS, and allows you to check frequency is a good feature to have when measuring generator output. Besides, Fluke makes the best meters in the business, IMO.
A good set of screwdrivers, a pair of adjustable crescent wrenches, and a pair of Klein wire strippers.
A case of Chem lights: These are good for when you are in your safe room, and need long duration light without killing flashlight batteries.
A couple of these. Be careful, some of them are made by inferior companies. I know, because one of mine didn’t hold a charge for more than an hour, even if it wasn’t being used.
A cable bike lock, to secure your generator while it is outside running. I chained mine to the second car during the day, and when I shut it down at night, it went back into the garage.
A propane stove, and the adaptor to use it with full sized propane cylinders. Also, make sure you have at least two cylinders.
Good work gloves. Your hands are essential to survival, and an injury during a natural disaster means that you are now useless. I use mechanic’s gloves from WalMart. They cost about $15, and are much better than gardening gloves or generic leather work gloves, because they are more comfortable and allow more dexterity.
Plenty of rechargeable batteries. While we ran the gennie during the day to cool down the freezer/refrigerator, we also watched TV and recharged batteries, and got cleanup done. These tools were vital to making that happen.