The Fever-Tree Premium Indian Tonic water uses a handful of different botanicals, including our distinctive natural quinine and oils from Mexican Bitter Oranges, to give a uniquely clean and refreshing taste and aroma. The story of Fever-Tree is one of a pursuit for the best. In 2004, unhappy with the poor state of spirit mixers, founders Tim and Charles began trawling through history books and poring over maps to find sources of the very best ingredients, eventually travelling to the ends of the earth to get hold of them. Our Indian Tonic Water still uses natural quinine from the deep forests of the Democratic Republic of Congo, found by Tim and Charles on one of their first trips.