Jan 29, 2012
commented on Kerosene Fires and Smooth Operators
"So they took to pouring quinine into their gin along with a splash of tonic water—there, that's better."
Quinine is what makes tonic water, tonic water. Water + quinine (and nowadays a little sugar) = tonic water.
Also its colonists, not colonialists. A colonialist is someone who advocates for colonies (usually sitting at home in Britain), a colonist is someone who contracts malaria while serving in the colonies ;)