Abstract: A refillable water bottle system includes a container having a neck defining an outlet and receivable by a conventional bottled water dispenser. Opposite the neck, the container includes a cap defining an inlet for receiving water into the container. A first lever is coupled to the cap and pivotally movable about a horizontal axis between a closed configuration covering the inlet and an open configuration displaced therefrom. A second lever is coupled to the cap and pivotally movable about the same horizontal axis. A ball valve is suspended within the container and tethered to the second lever such that movement thereof seals or unseals the outlet. The second lever is larger than the first lever and longitudinally aligned therewith, making the first lever inaccessible at its closed configuration when the second lever is at its unsealed configuration. This prevents a user from opening the inlet prior to sealing the outlet.