Hi! In order to maintain water balance in the body, each person must consume a certain amount of water every day. But some people practically do not drink ordinary water. To change this, the Cirkul bottle was created, which can be filled with flavoring cartridges, and therefore drinking ordinary water becomes more pleasant. If you want to know more about this bottle, you can contact cirkul customer service and they will provide you with the information you need about their product.