Did you mean that you cannot turn your MacBook ON again? I ask because you mentioned that your MacBook turned OFF again and that you need it working again. I also would like you to know and understand that water damage to an electronic device almost always accompanies with some form of failure, either immediate or in the future. It is very difficult to judge the damage without getting inside the MacBook.
You can try pushing down and holding the power button down for 20 seconds and then releasing it. See whether that turns the unit ON. If that does not work then you can have your MacBook Pro examined at the Apple Store or an Authorized Service Center when they open or contact ➔ Apple Support
Axel F.