If you don't want to take it to Apple then at least let it sit for as long as it takes for the water to evaporate again. If you then can use it, fine, but if you have problems then you know where to go.
Genius Bar appointment - Unfortunately this online reservation is now difficult to get to directly. Go to https://www.apple.com/retail/geniusbar/ > Get hardware help. Select your hardware and continue selecting options requiring replacing parts until you see "Bring in for Repair" --> Sign in with Apple ID
Click on this link to find your nearest Apple Authorized Service Provider (AASP) or Apple Authorized Distributor (AAD) --> https://locate.apple.com/country or see if you can find any service locations in https://locate.apple.com/findlocations Some places with limited support may be included in the "other" link at the bottom of a region selection.