I spilled water on my MacBook. Now it won't turn out

First thing is to not try powering the laptop on after the water fell on it. Next, you should remove the battery off the laptop immediately. When this is done, you should fully disassemble the laptop & thoroughly inspect its inside. Look for any traces of water on the circuit boards & on other components. On circuit boards, water damage appears in the form of whitish traces. These needs to be wiped off. This can be done using a tooth brush moistened with few drops of hand sanitizer liquid.
Check all internal connectors & make sure that no water seeped into them. Dry them if needed.
When you are done, re-assemble back the laptop.
If the water fell on the keyboard & you found out that the keyboard is no longer working, then you will have to replace the keyboard.