1. Fill the bottle to the recommended fill level (where the curve of the bottle shoulder begins) and screw the lid on tightly until it is fully closed.
2. Hold the bottle upright and press the carboniser button firmly so you can hear the CO2 flowing into the bottle. Keep the button pressed until you hear the overpressure release, which sounds like a slight "blowing off." It takes 5-20 seconds for the overpressure release to activate, depending on how strongly you press the carboniser button.
3. Now shake the bottle vigorously to make the water sparklier.
4. Carefully open the lid, or if you want stronger sparkling water, you can press the button again.