Getting water damage alert in my iPhone

I doubt that your port or cable is wet, unless the humidity there is off the scale.

This message can sometimes occur if there is dust or lint in the charging port. Use a flashlight and a wooden toothpick to very carefully clean out the port. A magnifying glass can really help as well.

Do not used compressed air.

If the message still appears, make an appointment at the Apple Store or take the phone to an authorized Apple Service shop. The link below will list authorized service shops in your area:

Genius Bar Reservation and Apple Support Options - Apple

Please also take a look at the following article ⇢ If you see a liquid-detection alert on your iPhone - Apple Support