Not much, it's probably ruined. If it was exposed to salt water, chlorinated pool water or totally immersed in any kind of water for more than the briefest moment then it's as deadly to digital cameras as fire or crushing.
If the camera has just been caught in rain then it has a slim chance if the memory card and battery are removed immediately, all water is wiped off the outside and if you see any inside then wipe that up too. Give the camera a few hard swings at arm's length, holding it so that the baseplate is furthest from you to try and shake any water down and away from the electronics. Put the camera in a sock with the battery and memory card doors open, tie or clip the end of the sock closed and then bury the wrapped camera in uncooked rice in an open jar or cardboard box. Put the whole lot into a dry, preferably warm, well-ventilated location for at least a week.
If you're lucky, the rice will draw out any remaining water and the camera will work again, but expect the cameras remaining lifespan to be considerably shortened.
Note that the above can potentially save other devices like mobile phones as well.
Good luck, I hope that you've found some hope in my answer. Please take a moment to rate my reply.
DO NOT TRY TO TURN IT ON! You will probably fry the circuits. Remove the battery and memory card and dry those areas as well as you can. Bury the camera in a bowl of dry rice for a week before trying to turn it on. Then, keep your fingers crossed. Depending on how wet it got and what kind of water or liquid it was exposed to, you could still have problems with haze between the lens elements, an LCD screen that won't operate properly, etc.
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