Dilution
After mixing up the concentrate to the prescribed recipe (including all recommended safety precautions - see links ), the syrup is diluted 5:1 with ("preferably sodium-free") soda water to make the finished drink; at this dilution, the above combination of ingredients will yield approximately 24 litres of OpenCola.
The full recipe also includes instructions for home-made soda water produced from basic ingredients such as yeast and sugar in order to make the entire process open source, otherwise there would be a need to use commercially-produced bottled or canned soda, or consumer carbonation machines (such as Soda Stream) with commercially manufactured carbon dioxide canisters.
Read more about this topic: OpenCola (drink)