... a few items which may be of use.
There are a number of inflatable boats available here, here or here.
Damp houses will need to be dried out, so you'll definitely want a dehumidifier like this or this.
Or if the power goes off, how will you keep up-to-date with the news or see where you're going? You'll need one of these torch/radios.
But if you do get wet, or even just if you have to leave home in a hurry, you may be really glad of a little warmth. These foil blankets are real life savers.
For injuries, you could do worse than keep one of these medical kits around.
And all this is available on eBid.
Some useful advice on how to cope with flood damage.
And more here.