Tonic water

Tonic is water charged with carbon dioxide and flavored with fruit extracts, sugar and an insignificant amount of quinine. Some manufacturers also produce diet tonic water. Tonic water is used as a mixer for alcoholic drinks, especially gin. When tonic water is flavored with lemon or lime is knows as bitter lemon or bitter lime. Tonic water will glow under a black light, due to the quinine.