Add <quantity>1<unit>L</unit></quantity> of coconut water to a sterilized plastic bottle

Add <quantity>50<unit>ml</unit></quantity> of citric acid solution

Add <quantity>50<unit>ml</unit></quantity> of simple syrup and <quantity>¼<unit>tsp</unit></quantity> of coconut extract to a cup

Mix until homogeneous

Transfer the simple syrup mixture to the bottle

Gently squeeze the bottle to remove all excess air and close it with a carbonation cap

Attach the keg coupler to the carbonation cap. Adjust the pressure of the CO2 valve to 40 psi and turn the valve on the regulator to open it. Gently shake the bottle for 15s. Close the valve and remove the keg coupler

Carefully remove the carbonation cap to remove the excess pressure from the bottle. Put it back on

Repeat the process of attaching the keg coupler. Adjust the pressure of the CO2 valve to 40 psi and open the valve on the regulator while gently shaking the bottle for 15s. Close the valve and remove the keg coupler

Carefully open the cap to remove the excess pressure from the bottle and close it back. The coconut soda is ready