What should I do if my MacBook suffered liquid damage

My computer was put in my backpack, and the water leaked out from my bottle. My computer was upright, just like following graph.

Minutes later I notice this problem and take my Mac out, but it is automatically shut down. This happen 10 hours ago. During this period, I put it in a dry space and try to make it dry. But it still don't work. Today is Christmas and all the bar was shutted down. what kind of action I could take right now.

[Re-Titled by Moderator]