Ninja Thirsti™ Drink System (Black), Sparkling and Still Water, 6-oz. to 24-oz Sizes, Includes 60L CO₂ Cylinder & Flavored Water Drops. Personalize flavor and fizz to create thousands of still and sparkling drinks at the touch of a button. Customize your drink by 25+ flavors, 2 flavor strengths, 3 fizz levels, and 4 drink sizes.