J.
I dont know what made him afraid of the water. Maybe there is something that happened that you dont even realized happened. I would just start slow with giving him a sponge bath, then try to help him understand about water. Maybe you can try new bath toys or make a game out of bath time. Maybe the water is too hot or too cold. I think if you force him, it will only make it worse. Sorry I couldnt be of more help.
J.