For the best tonic taste, the SodaStream Classic Diet Tonic packs the perfect punch. Simply carbonate your water using SodaStream and then add the Diet Tonic afterwards. With just 1 bottle of mixture making up to 9 litres of flavoured sparkling water, be kinder to the environment. Our classic drink mixes taste just like the brands you know but have 50% less sugar than store bought soda and no high-fructose corn syrup or aspartame, plus you can add as little or as much as you prefer!