Soak off any labels in soapy water and rinse thoroughly. Fill the bottle about 3/4 full with warm water. Add 7-10 squirts of the handsoap, screw on the lid and shake well until the soap is mixed. Then "top off" the bottle by adding water to about 1" from the top. (This allows for air expansion as the bottle heats up). I recommend creating a rubber seal for the lid by cutting another piece of the mousepad you used for the base. Cut to fit inside the lid. This helps insure that no water leaks out of the top.