Fever-tree Tonic Water, Naturally Light Is A Satisfying Drink. By Blending Carbonated Spring Water And Pure Fructose Sugars With Natural Quinine, Fever-tree Has Created A Delicious Natural Tonic With 54 Percent Fewer Calories. There Are No Artificial Flavors, Sweeteners Or Preservatives. Each Bottle Contains 16.9 Fl. Oz. Of Low Calorie Premium Tonic Water.