iPad has no resistance to water damage. Unlike some models of iPhone, iPad is not designed to withstand exposure to liquids.
Water and electronics do not make happy bedfellows; if your iPad has become wet, it is very likely damaged beyond repair. Do not attempt to switch-on on charge the iPad - as you are likely to cause yet more damage.
Your best option is to visit the Genius Bar at your local Apple Store or Apple Authorised Service Provider (AASP) - where the technicians will be able to assess your iPad - and you’ll be able to explore your available options:
Genius Bar Reservation and Apple Support Options - Apple
If you have benefit of an active AppleCare+ plan, you will likely be able to claim for accidental damage; assuming the claim is accepted, a qualifying device will usually be replaced with a reconditioned/renewed iPad of the same model and specification - the cost being a small excess/deductible fee.
Otherwise, an out-of warranty repair repair, if accepted, will likely be charged at c.60% of the “as new” cost of your current iPad:
iPad Service & Repair - Apple Support