First thank you sir for your military Service and serving this grateful nation. TURN off water and open a few other sinks to let pressure release. Now make sure the water is off. truly off. More than likely on the base where connected to the wall is where it may come off the wall connection. Replace with a new or check all rubber washers like you have in a water hoses. Make sure there not PINCH, twisted if so replace them (the rubber washer). Everything goes on Clock wise turns. Look close at the head and you may before adding to much pressure before turning where the link is coming from. Hard to fix in the bathroom bast to remove it outside where you can work on it and go easy. WalMart, SOme Auto Parts Houses should have replacements oh yes Dollar Stores. GOOD LUCK.
Welcome to IRV2 FORUM, be safe have fun and enjoy the adventures in your RV. Pack out what you bring into a campsite.