so far your list seems fine, but I also like the idea of having a water purifier. As far as the first aid kit goes, I would not pack any thing you do not know how to use. I use to drive around southern California with a well stocked ambulance and rarely if ever did I need much more than basic first aid stuff such as a role of gauze and 4x4 dressings. And yes I went to quite a few shootings and stabbings.
* (Swinging club) Whack! whack! whack! *
Nope, the old nag's still dead .