Tonic water is a carbonated mixer containing quinine. It is carbonated water flavored like a bitter lemon or lime, with a little sugar.
An interesting trait of tonic water is that quinine is fluorescent. By using a black light, you can make the liquid glow; your bar setup may be interestingly enhanced by stocking extra tonic water in clear bottles at strategic locations, and using a blacklight to produce the interesting glow. A clear-top bar with fluorescent tube blacklights run under it would also make certain drinks glow.
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