Q: Just dropped water in my macbook pro, what to do?

Turn it off, wipe up all visble water, turn upside down, while open, for any water to drain out, pray. Wait a day or so & attempt to turn on. Keep it in a warm location.

Do NOT turn it on!   Remove the battery now.

If it was clean water and you are lucky it may dry out again without damage.  How long this would take I have no idea.  It depends upon how much water and atmospheric conditions.  I know some people with small devices put them in bags of rice, but with a keyboard this might get very messy.  Maybe turning it so any water can drain straight back out the way it came in might help.  I am sure there are hundreds of suggestions if you do a general web search.

If you  wish to be prudent you can take it straight to a  Apple Authorized Service Provider (AASP) or Apple Authorized Distributor (AAD) - http://support.apple.com/kb/HT1434  It is a very expensive piece of equipment.

Limnos wrote:

  Remove the battery now.

 

How were you able to determine the OP's MacBook Pro has a removable battery?

How were you able to determine it didn't?

Exactly, which is why I made no comment regarding the battery.

aline.thiel -  Check http://support.apple.com/kb/HT3053 - MacBook Pro: How to remove or install the battery  If you cannot remove the battery then I humbly apologize for providing you information which could have caused you emotional distress when you looked up how to remove the battery and could not  find out how to do it without posting back here and asking how.  I was just taking the prudent course in trying to provide you with a way to minimize risk as fast as possible by providing a complete list of options that might be open to you given the information you initially provided us,  To avoid this in the future it helps to include full information about your MBP model when asking a question since as you can see the features of different models vary. If you can remove the battery then you should do so to remove any possibility of circuits getting powered on which could result in a short circuit and components on your computer being permanently damaged.

Note the above article does say, "For issues with MacBook Pro models that have built-in (non-removable) batteries, you should work with an Authorized Apple Service provider or an Apple Retail Store. "  This might include a wet computer.  I will hope my colleague on this forum does not object to my posting that recommendation since you have not yet told us whether or not you cannot remove the battery and if you can then I have again provided you with excessive information.