Unscrew the bottle and fill with water.
Replace the bottle to the tray and tighten securely.
Holding the bottle upright position by grip, flip tray completely away from the bottle (automatically opens the valve).
Turn the bottle upside down with the tray extending in front of the bottle (valve is open).
Squeeze bottle gently to release desired amount of water into the tray.
When finished, return bottle to upright position and flip closed so that the bottle nests in tray (closes valve) for automatic leak-proof portability.