Sparkling Low Calorie Soft Drink with Quinine with Sweetener. Try out Schweppes Slimline Tonic Water, a carbonated soft drink based on Jacob Schweppe's original formula from 1783. Enjoy classic, crisp tonic water with a taste of bitterness and refreshing bubbles while at a party or relaxing at home. Drink it straight or mix it with your favourite spirit to make your own tasty cocktail. No sugar.