Gargle warm salt water. No kidding, a dentist will tell you when you are healing oral surgery, the salt water hydrates the mouth/throat and facilitates healing because it cleanses. Saline replaces the moisture lost. I'm thinking 1/2 tsp. to a cup of warm water? Google it and find out the best proportions. Also, as everyone else recommends drink water. Good, purified, reverse osmosis water has chlorine and fluoride removed and does more for your health & well being than anything else you can do. Learn to like it straight up to replace any soda or juice you might ordinarily drink and you eliminate empty calories and sugars. Artificial sweeteners are not a suitable substitute for sugar as they wreak havoc with your body's hunger/satiety signals and carbonation introduces acids & CO2 into your system. Caffeine in coffee, tea & soda dehydrates as a natural diurectic and ultimately dries you out. Water, water, water!