Since Katrina did happen in my town, I'll just go ahead and tell you what I will make SURE I have on hand next time.
1-5: Chainsaw, fuel, sharpening file, extra plug, bar oil etc
6: Good locking folder 3"-4" blade
7: Case Stockman
8: Vic Swisstool
9: A very good axe
10: small bow saw
11: As many very long lasting little flashlights as I can haul.
12: two teenage boys who are willing to do what I say
13: 22 pistol for killing snakes
14: Some kind of SD pistol, which I probably wouldn't carry around on my person, since I didn't last time.
Most of these things are with me most of the time, so I would concentrate on good little long lasting flashlights + batteries and making sure the chainsaw is tuned up and ready.
I would say I would make sure of having food and water on hand, but I live down the street from an Assembly of God Church, and these people have a direct line to the big man upstairs because the day after Katrina for 2 weeks straight there was a steady flow of food water and clothing coming in to that church, and I helped them unload a great deal of it and loaned them all my ice chests - in turn they supplied me with plenty water and MRE's which they had in unbelievable abundance.
I know none of this sounds very desperate or swashbuckling, but in real life it wasn't. I spent 6 months making big trees into firewood basically. the first month of it without electricity. It was a hell of a lot of work. I did meet a lot of nice people from various utility companies around the country.
To tell you the truth, ten minutes ago I cut off a chunk of tree trunk from a tree that Katrina felled and threw it in the burn barrel out by my dog pen to keep them warm tonight.