Tonic water is a carbonated drink that is made from water, sugar, carbon dioxide and quinine. Quinine is a compound that is found in the bark of the cinchona tree and it is what gives tonic water its distinctive bitter flavor.

Tonic water is a popular mixer for cocktails and it can be used to add a touch of bitterness to drinks like martinis and Manhattans. It can also be used to add a touch of sweetness and carbonation to …