What parts are needed to repair water damaged phone?

Hello,

My phone was only wiped with a damp tissue, not sure how it caused the damage. I started getting the phone is heating message and keeps turning off, even though the phone is cold. I checked the sim slot and the slip was red.

Can someone help me with what parts I need exactly to fix water damaged phone (the usual fix for many people ) , I've read about replacing the battery, but since it was just a wet tissue I doubt the battery was damaged. I would like to leave the battery as the last solution to try. Please refer me to other parts that I should replace before the battery.

And are all the A50 parts the same worldwide?

Help is needed, I would like to purchase them asap.

Thanks.