With this water bottle for pets, only one hand is required to give the dog water on the go. Simply press the middle button with one hand to control the water flow and the amount of water released. Turning the button closes the bottle and safely prevents leakage. The built-in carbon filter made from coconut shells allows you to safely fill the bottle from most sources. The container is made of durable, BPA-free Tritan plastic, and the antibacterial mouthpiece is likewise BPA-free.