All in all it sounds like you are lucky the camera is fixable and the lens did not shatter. Until you send it off put the lens and shutter, seperated, into some rice. DOn't bury the shutter in the rice just place it on top. Don't shake it either. Rice dust will get everywhere you don't want it if you bury the shutter. Good luck.
The shutter seems to have dried out quite nicely enough on its own, surprisingly. And it is almost fully functional again. I will put it in a tupperware container with the rear element still on the lens, and use that to keep the body of the shutter out of the rice. It was fresh water, with very little particulate matter in it, so I'm not panicked about water damage the way I would if it had fallen in salt water.