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Pour the syrup and soda water into a glass at a 1:5 ratio. Stir the syrup and soda water with a spoon. Add ice to the drink or enjoy it on it's own. Store leftovers in an airtight bottle in the fridge.
Multiply the amount of syrup by 5 to determine how much soda water to add. For example, mix 60mL (12tsp) of the syrup you created with 300mL (61tsp) of soda water to create a large glass of cola. Carbonated water and sparkling water also work as mixers. Mix the liquids until the cola has an even color. Stop stirring the cola once the liquids are combined, as over-mixing will cause the drink to go flat quickly. If you are using a thin glass, use a metal straw to stir the syrup and soda water. Cola tastes best when it is fresh, as the bubbles disappear quickly. Add 3 or 4 pieces of ice to create a cool and refreshing drink. Alternatively, enjoy the rich and undiluted flavours of the cola by itself. Avoid leaving the cola in a fridge to cool, as it will lose some of its bubbles. Pour the cola into a bottle and tightly screw on the lid. This helps to minimise the number of bubbles that can escape from the cola. The cola tastes best the day you make it; however, the drink will still have some bubbles for up to 4 days. Clean recycled soda bottles work well for storing cola.