Well, I threatened some mixology, and it has been a while since I’ve done anything with cocktails…
Two videos on the gin and tonic, with associated discussion on malaria and quinine: the “How to Drink” guy:
And Alton Brown:
Bonus, also from the “How to Drink” guy: “A history of Tiki: Donn the Beachcomber”. Personally, I find the backstory behind Donn Beach interesting, which is why I’m linking the video here. The cocktails strike me as sort of fussy and requiring various specialized syrups and ingredients (“Velvet Falernum”, “Fassionola Syrup”), which you may be able to get mail order (if the store isn’t sold out). Frankly, I like cocktails that I can make from a relatively small number of ingredients that are available locally.
The “Missionary’s Downfall” does sound feasible, though I don’t generally keep peach brandy around.