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As good as it gets. The first carbonated drink was Schweppes Tonic which was developed so that people could drink quinine as medicine in spite of its bitter taste. You can formulate bitter soft drinks without quinine but you may not be able to call them tonics depending on local legislation. Without quinine you also loss the slight blue phosphorescence of tonic water.
Auxiliary verb + do In British English it is common to use do as a substitute verb after an auxiliary verb. Americans do not normally use do after an auxiliary verb. There is no formal reason for it. It's just another idiosyncrasy that separates the British and American forms of the language we call English.
The British call a flashlight a torch.
A Sub or Substitute.
In the game of Scrabble, you can use the word "exert" as a substitute for "apply effort".
What Americans call pants, the British would call trousers.
You might call it ''ANARCHY".
....a can.
british columbians
The British call the dot at the end of a sentence a "full stop."
They call it cream too.
They call them sinks.