Remove the battery, loosely wrap it in paper towels, place it in a ziplock bag with some rice. Ensure that the rice cannot get into the camera. Leave it in there for a day or two, thee to be safe.
This is what my friend did to fix her cell phone after it fell into a stream. I don’t remember if it actually worked or not, but the idea is that the rice will act as a desiccant. I’d imagine if it turns on at all it’ll be OK once it dries out. But it’s hard to say.