. Drinking too much water Drink water when you’re thirsty. Drinking too much water can even cause dehydration. If you are prone to kidney stones, drink at least 2.5 liters of fluid a day. Different factors determine how much water you need, but it’s important not to have too much. 2. Drinking water too quickly When you drink water too fast, it can create swelling. 3. Drinking the wrong fluids Not all fluids hydrate you. Some can even dehydrate you. 4. Drinking while eating This can weaken your ability to digest foods, especially protein, and could lead to GERD or acid reflux. If you drink while eating, don’t overdo it. It may be better to have something to drink 30 minutes before or after a meal.