I love the water and luckily so does my horse! We crossed the river in the valley. The first time she didn't want to go across, I think she was a bit nervous so I led her half way, she was so funny. She followed my exact steps, and watched me carefully. I plan to go on at least a 2 day trail ride with my friend and go swimming in the lake.
I think ponying the horse would be a good idea to start out, then the horse isn't worrying about the rider, and has an encouragement from infront of them. Then I would put a person on the horse and continue to try it again. Then go out and get in again, this time when the horse is comfortable and feeling good I would take off the lead shank and keep going.
That's a way to do it without you guys getting wet too.