>From the outset, it was laced with memories, or myths, of imperial rule; what Schweppes first sold in 1870 was not just tonic water but “Indian Tonic Water,” and today, though besieged by an army of Fever-Tree tonics, it still holds considerable sway. The water is tonic because it contains quinine, which is anti-malarial—a lifesaver, if you happen to be invading or infesting a marshy foreign land.

Oh yes - gin and tonic should be rightfully considered India's national drink. Its what the British had to invent to not die.