I was going to ask if something might have froze, but then I noticed you're in Florida. I've known plenty of people to run 100% water down there with zero problems.
I read than your post that there's no oil leak. If it's smoking it could be a number of things coolant steam, oil on the exhaust parts or possible axle grease, front a torn cv boot, that's been slung against the exhaust parts.
On different occasions, I have experienced axle grease from a torn CV boot and a tiny 'wicking' oil leak from my valve cover gaskets causing the embarrassing "smoke through the scoop" condition.