The other day I dropped my iPhone X in a pool, it looked good at first, was turn on few hours and then black screen and not responding. Went to Apple store, they did diagnostic and said that there is nothing they can do(( ok, I can deal with it, but I wonder - is there any chance to extract info from it? I’m interested mostly in contacts and gallery… (I didn’t have and iCloud acc with back up for anyone who may ask). Thank you in advance for you advises
Best advise for future - do a backup! Icloud is super comfy for apple devices.
About extract the contacts and other - try this guys www.datarecovery.net They helped me ones, did great job.
That’s very sad. I would have started crying if this happened to me. Oh wait! I am an Android User. 
Kidding.
I think, @Seven Nine is right. Give a shot to any of these tools. It may help you!
try and turn it off immediately next time and let it dry completely
Put it in rice 
I saw people doing that but I do not know if it really works.hehe
For the future: make a backup!