Just buy Cask Strength Whisky and water it down to 40%.And so, I've discarded the rules of a lifetime and now slosh great measures of fizzy water into my whisky. It's been a good experience, and one I shall continue with, but only because of the limitiations imposed by my stupid pancreas. So; don't worry about the amount of filthy, unnatural water in your nip; what counts is the essential taste, and the effect. Whisky is whisky is whisky, and the tiny peculiarities of each variety make it uncommon good in most cases.
You know I'm right.