FIRST-- remove the battery NOW.
Got Your BlackBerry Wet? - BlackBerryFAQ
Mixing electrical circuits and water was never ever never ever good. It might work again, but it will take days and patience to find out. Read the tips above and above ALL, don't be tempted to pop the battery in for about 5 days. You might have already fried it.
Good luck with it. I have seen them recovered after a few days of treatment as described in the link.
AND, welcome to the BBForums.