As I've mentioned, my malaria prophylaxis ends with a shutdown. A poll

[Chan790]

15. The amount of quinones necessary to effectively prevent malarial disease...

is several times the amount in a 2L bottle of tonic. I hope you've got that gin by the 55gal. drum.

You need to find a cinchona tree, ideally Cinchona pubescens. The English imported them from South America to Europe and anywhere they conquered in large numbers because the bark contains a number of quinones used to treat malaria.

The vast majority of anti-malarials on the market are still extracted from cinchona bark (lab-synthesis is possible but more expensive, albeit yielding higher-purity quinones)...as is the quinine in homemade tonic water. Commercial tonic never contains more than negligible amounts for flavoring and to make it officially "tonic water" as quinine has a number of adverse drug interactions.