When you feel bloated, drinking water sounds as if it would only make matters worse, but it can often help, says James Lee, MD, gastroenterologist with St. Joseph Hospital in Orange, Calif. If you're on a high-fiber diet, for instance, then your body needs more water to work more efficiently, says Dr. Lee. "Water mixes with water soluble fiber and makes it into a gel like substance. This affects the motility of the gut and reduces the symptom of bloating." Drinking more water also relieves bloating caused by dehydration. When you're dehydrated, your body clings to the water your body does have, causing you to puff up.