Dash Water does contain a trace of calories. Roughly 1kcal per 100ml. Anything under 4kcal per 100ml can be termed as "zero calorie".
We use a blend of natural flavourings deriving from the fruit or vegetable the can is flavoured with, alongside real wonky fruit extract. This makes up a very small amount of our drinks and gives a subtle, natural taste to the spring water. We also add a small amount of acid to our drinks which helps stabilise them as they are made. There is no sugar or sweetener added to the drinks, and is a very simple way of flavouring water without the sugar and calories, making a beautifully crafted drink.