Natural flavors. 20 mg Of caffeine (per 8 fl oz serving). 20 Calories (per 8 fl oz serving). 3 B vitamins. No fruit juice. Any time you need a lift. What if there were a water that could give you a boost and hydrate you whenever you needed it? A vitamin enhanced, caffeinated, low calorie lift that fits your active lifestyle. Propel Invigorating Water: An any time pick me up that you can feel good about. Caffeine comparison (per 8 fl oz); brewed tea (major U.S. brands range from 20 - 90 mg of caffeine per 8 fl oz cup from International Food Information Council Foundation, 2007), Propel Invigorating Water (20 mg).