Spilled a drink? Classic! Lucky for you the cards are water resistant & have a protective coating, so they can handle the occasional splash. Just wipe ’em off, let ’em dry, pretend it never happened & you’re back in the game.
If the cards take a full dunk (not ideal or recommended), wipe off any excess liquid & lay them flat to air dry. They might get a little battle-worn, but most will bounce back.