20 calories per can. Lower in calories. Fever-Tree Refreshingly Light Premium Indian Tonic Water is 57% fewer calories than Fever-Tree Premium Indian Tonic Water. Made with natural flavors including natural quinine. No artificial sweeteners. Drinks International 2019: No.1 best selling tonic water as voted by the world's best bars. If 3/4 of your drink is the mixer, mix with the best. We believe a spirit is only as hood as the mixer it's paired with. That's why at Fever-Tree, everything we do starts...