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Yes, in naturally sweetened tonic water. No, in artificially sweetened tonic water.
Yes, Tonic water is available in Russia. Tonic water is available in a large percentage of countries.
The correct spelling is Schweppes Tonic Water. There are many people that also refer to the product as Schweppes Indian Tonic Water.
It can, but you'd have to drink a LOT of tonic water to do it.
Yes, tonic water has a pH around 4, so it is acidic.