Originally Posted by slamkal
you can also take out the valve if you have a tool for this. Not sure the geometry of your floor if its serpentine you will have a harder time getting the floor to drain.
humidity should be low enough inside your house to eventually get the water to dry out. I wonder if you could inflate with warm air from your hairdryer?
If you end up taking apart the valve (not hard to do & relatively easy to re-install), I might even suggest dropping a desiccant on a string inside the bladder.
Homemade Desiccant Packs | eHow.com
Get a bunch of silica gel from Hobby Lobby, put it in a sheer stocking and let it absorb the moisture inside the bladder. You could even replace the valve & leave the desiccant inside the bladder until later in the season. It won't hurt the bladder to have it rolling around in there...
I'd do this after a couple of wet vac inflation/deflation cycles.