It may cause gastrointestinal trouble. Even when it comes to lemon water, too much of anything is bad. While lemon juice has several health advantages, squeezing too much into your water can have serious health consequences, such as aggravating ulcers and developing GERD, according to Livestrong.com. If you're drinking excessively large amounts of lemon water, consider what effects this is having on your body over time. Too many juices or drinks high in acid will erode your tooth enamel and damage your teeth over time. The same goes for drinking too much water; it can do more harm than good if you're not careful. Lemon water is an excellent beverage to promote digestion, cleanse the liver, and rid the body of toxins. However, if you are vomiting frequently or experiencing diarrhea, then perhaps limiting yourself to only one glass or bottle per day is too much. Overall, drinking enough water is important for health, but too much of anything is never good for you.