Lurker here. I saw an earlier anon post to make your own quinine … very simple! “Take the rind of 2-3 lemons , 2-3 grapefruits…the peel only… place in a glass pot ( metal is fine if you don’t have glass) cover rinds with 3” of water , cover pot, simmer for about 2 hours, do NOT take lid off until it cools completely as this will allow the quinine to escape in the steam. After completely cooled ,you can add honey or sugar since it will be bitter. Take one tablespoon every couple hours.
Hope this helps! I have tonic water on hand, contains quinine, but making it yourself is the best way . Prayers for you!