What are ingredients of tonic water?

Tonic water typically contains carbonated water, sweeteners (such as sugar or high fructose corn syrup), and quinine, which is derived from the bark of the cinchona tree and gives tonic water its characteristic bitterness. Some brands may also include flavorings such as citrus or herbs to enhance the taste. Additionally, tonic water may have added citric acid or other acids for balancing flavor.