COMPLETE STARTER KIT: Innovative water bottle and cartridge system that makes drinking water more delicious, fun, and personalized. CUSTOMIZABLE FLAVOR DIAL: Cirkul's Flavor Dial technology gives you full control of your flavor; dial up or down as you please. DELICIOUS FLAVORS: From enhanced waters and sports drinks to iced teas and energy drinks, Cirkul has beverage options for everyone. ZERO CALORIES & NO SUGAR: All Cirkul flavor cartridges are zero calories and have no sugar, no artificial flavors, and no artificial colors. MULTIPLE REFILLS ON THE GO: Each Cirkul cartridge contains an equivalent amount of flavor to six 20 oz. conventional bottled beverages. Results will vary based on dial setting.