What and how much you drink can promote or disrupt good sinus health. To keep the mucus produced in your sinuses flowing smoothly, you need to drink enough water, says Kelleher. For some people, dairy products can cause mucus to thicken up, and that may cause sinus pressure and congestion. Drinking alcohol, especially red wine and beer, can also cause sinus pressure and congestion. Avoiding these beverages when you have sinus problems, and drink at least six glasses of water every day to help keep sinus mucus thin and mobile.