Granted I don't live in Florida, nor have I ever ridden there or in similar climate, but it does get into the 100+ fairly regularly during the summer around here. That being said I have found that you can condition yourself to not need a lot of water during a ride. When I first started riding I would always go out with a full hydro pack and usually come back with it empty. Every stop during the ride I would be gulping it down. Now after riding a couple years consistantly, I take 1 water bottle with me and rarely do I drink all of it. And this will be on a 10-15 mile rides with lots of climbs, exposed and in the sun. Couple of quick sips here and there to deparch the mouth and throat. I have found that rather hydrating during a ride, hydrating before makes a lot more of a difference. Lots of water the night before, and lots of water an hour or two before the ride seems to do the trick. Followed by lots beer post ride, gotta get those carbs . Just my two cents.