I spilled water over MacBook Air keyboard. Any immediate advice. I turned it off and it’s drying upside down open on towel

How to find your nearest Apple Authorized Service Provider (AASP) or Apple Authorized Distributor (AAD) - https://locate.apple.com/country

Genius Bar appointment - This is tricky 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

If you do not have a service center near you, you can try keeping it turned off for a day or two. If it was just water, and you're lucky, then it may not have caused damage. If it starts behaving strangely then get it looked at.

I also note this computer is running Yosemite which means it is likely a pretty old computer. Depending upon the age, Apple may not even offer to look at it at all:

Obtaining service for your Apple product after an expired warranty [was: Vintage and obsolete products]

https://support.apple.com/HT201624

What’s the best way to extract spilt water on a MacBook Air ?

Cunji wrote:

What’s the best way to extract spilt water on a MacBook Air ?

Take it to a service center. Water and electronics and electronics do not mix.