The best thing, as suggested is to send it for professional care.
However, when I used to shoot sports our gear regularly got soaked (english summers!) and we never had time to get them seen to. Our trick was after drying with a towel to take everything off the lenses, caps filters etc and lay them near but not on a low heat source eg unlagged water pipe, radiator on low or an open airing cupboard. This would slowly dry the moisture/water. Silica gel will help.
Wouldn't put in direct sun as different parts of the lens heat at different rates leading to evaporation and more condensation of the water.
Slow is best. Just be grateful it wasn't salt water!