You can salvage that if its not plugged in... Just dry throughly before turning it on again XD.
I've salvage a few electronics from water. last one was a few years ago when an ipod nano 2nd gen went though the washer. Forgot it was in a pocket. But i took it apart. left it alone for about 2 days and viola. Worked like nothing ever happened.
I would imagine it would be the same thing for a computer. leave it unplugged, drop in water, let it dry for a long period of time, and it will still work after all that.