Fever Tree Refreshingly Light Tonic Water is made using naturally sourced quinine from the bark of the fever tree in the Congo, blended with spring water and Tanzanian bitter orange, much like their Premium Indian Tonic Water. To make a lower calorie option without the use of artificial sweeteners, natural fruit sugars are added instead giving a much fuller mouth-feel and without the unpleasant aftertaste of sweetener. Importantly, no preservatives or artificial ingredients are ever used in any of Fever-Tree's products. If three quarters of your Gin & Tonic is tonic, then you should be using the best tonic. This is the attitude Fever-Tree brought to the craft of their original Indian Tonic Water and a standard they continue to apply across their range.