Yeah, I remember reading something similar years ago. But I suspect with the proliferation of "craft tonic water" there may be some "flavours" that don't contain quinine at all.
And 6L of tonic water is... quite a lot.
And 6L of tonic water is... quite a lot.
Shudder.
The ibuprofen did its job though.
(I do not recommend this and am not a doctor)