Zoinks! Sounds like it is fried.
A very lengthy drying out period with the battery OUT is about the best you can do, and then only hope. I have saved two, lost one. Got Your BlackBerry Wet? - BlackBerryFAQ
But due to the conditions and length of time in those conditions...
The no battery symbol is basically a sign of no battery charge, it could take it an hour or more to move off that IF it will continue to charge. You may be in business if it will charge further.
According to how long you actually let it dry out, you might give it somemore time, up to 4-5 days, with the battery out, and try again.