Vitamin water beverages contain various vitamins and additives, and some also include sweeteners. If your diet is generally balanced and healthy, or if you are taking multivitamin supplements, drinking vitamin water is unlikely to be beneficial for you. If you are trying to lose weight, the calories in vitamin water can be counterproductive. Therefore, it is important to carefully check the ingredients listed on the product label. Remember, fruits, vegetables, and other whole foods are the best sources of vitamins and minerals, and plain water, as a healthy, calorie-free beverage, is hard to beat.