My phone tells me there's water in the port after I plug it in sometimes.

There's no danger if the phone has hardware to detect the water ingress and software to notify you. My phone when dead has given me this message, and I hit it was canned air like to clean your keyboard. Sometimes, it takes a few tries before the message goes away.

You should be fine to plug it in if you've done your best to dry it. They assume far less careful people than you will be using them.