Have you any idea how the recipe of gin and tonic was invented? To give you a clue it wasn’t an inspiration of a bartender. It was for a more practical reason!
Gin and Tonic were originally created by the British East India Company as a way to get soldiers to have quinine to prevent and treat malaria.
Quinine (in tonic) was too bitter.
In order to get them to drink the tonic officers added the soldiers’ gin rations with sugar, lime and water, according to wikipedia.org