It's really pretty simple. Keep a good selection of your backpacking/camping gear tucked away in the vehicle, such that you have the ability to eat and sleep when stranded. Most of my second string stuff winds up in the vehicles, along with a decent supply of canned goods and a few gallons of water, and also a pair of good walking shoes.

One thing I didn't see on the lists is a small swedish saw. One can come in very handy when fallen trees have blocked the roadway.

And yes, location matters. I carried a lot more when living in Flagstaff, AZ than I require here in southern California. I don't imagine you would require too much gear in the sunny Florida climes.