Water may have short circuted your battery, or and charging port connections. you can remove the under panel of the laptop, very careful.. Ifixit has a range of tools to help. It’s a very tedious Job and it’ll take some help. Here is a video on opening the laptop and disassembling. I’m not sure if it’s the same one, But they use actual suction hot plates and machines. https://www.youtube.com/watch?v=s0ZetBuzt0w . You may unfortunately have to replace the battery, but see if there are any connections fried or come lose from the charging port to the battery.[br]
Hopefully you can get it, please update me. I’d like to hear how it goes![br]
Goodluck my friend!