You may have heard that doctors recommend drinking a glass of water before or after drinking tea. Drinking water around the same time that you're drinking tea will decrease the acidity levels in your stomach. Consuming too many acidic beverages can lead to ulcers in the stomach lining. Soda and coffee are other highly acidic beverages. Drinking a glass of water after you drink your tea can also wash away some of the acidity (and sugar if you use it) on your teeth. This will help preserve your tooth enamel, prevent staining, and decrease the likelihood of developing cavities.