Chosen Solution
I recently dropped my water bottle in my schoolbag and my IPOD was at the bottom. When I went to turn it on it wasn’t working. I plugged it into the computer the Apple logo came on. However nothing else happened. I tried putting it on disk mode and re-starting the Ipod. However now (even if the battery is charged) the Ipod will only stay turned on if plugged into the computer.
Usually, the battery is the first component to go in water damage, so your battery might be dead. Try replacing the battery. In the meantime, open her up using one of the guides here and get to cleaning the inside with 90% alcohol and try to do damage control. Do not keep attempting to turn it on as you might damage other components.