Cirkul 22 oz Plastic Water Bottle Starter Kit with Blue Lid and 2 Flavor Cartridges (Fruit Punch & Mixed Berry)

You just have to know how to use this, I see a lot of people say they don't get but 2 bottles of flavor out of it and you just have to know how to use it. Start out on 2 or 3 then after 2 bottles when you can't taste anything move up to 5, 2 more bottles the taste is gone again move up to 7 then when the flavor is gone again move up to 10 for your last bottle or 2 and you will get 6 bottles maybe 7. My son likes his pretty strong and doing his this way he gets at least 6 bottles of flavor and it's a lot cheaper and easier than multiple flavor packs or drops, just 1 cartridge a day and done.