I was just wondering how I can figure out my mac is Ok after water damaged!

100% agree with Bob. Liquids can slowly damage internal components, just as not wiping water off untreated steel can cause rust.

I recommend placing your homeowners'/renters' insurance carrier of a potential loss as soon as you can. Too many wet notebooks never recover. You could be looking at US$700-100 for a new logic board; too often, a dunking is fatal.

It needs to be inspected by an authorized service center. Water damage can and is often extensive and ongoing.