Interesting list of questions!

I don't live in a place that permits the storage of gasoline. I'd imagine many renters and condo owners are in a similar situation.

Watching the Florida evacuation does make me wonder what I'll do for gas if I find myself running away from a hurricane. Traffic is going to slow down to a crawl, and your car will idle a lot, eating up gas without getting you nearer to the destination. An 8-hour drive might turn into a 16-hour drive, with no way of getting gas. Let's assume that I can find all the gas I want near home. Carrying 10-15 gallons of gas in the trunk seems like a bad idea. What would you do?

The air boat doesn't look too hard to build yourself. In fact, if you google a bit, there are some DIY air boats, but I don't know how practical they'd be. The parts do look like they come from the Home Depot.