what should I do if I dropped abit of water on the charging port? Now it won’t charge

Most iPhone and iPod devices are equipped with Liquid Contact Indicators (LCIs) that you can see from the outside. An LCI will activate when it contacts water or a liquid containing water. The indicator's color is normally white or silver, but when it contacts water or a liquid containing water, it will turn fully red.

Water and other liquid damage to iPhone or iPod isn't covered ...

Put the phone in front of a fan for a few hours. If that doesn't help, make an appointment at the Genius Bar to have it diagnosed.

Genius Bar Reservation and Apple Support Options - Apple