https://www.jeffreymorgenthaler.com/how-to-make-your-own-tonic-water/ https://www.jeffreymorgenthaler.com/how-to-make-your-own-ton... you can buy the cinchona

https://www.jeffreymorgenthaler.com/how-to-make-your-own-tonic-water/ https://www.jeffreymorgenthaler.com/how-to-make-your-own-ton... you can buy the cinchona bark on amazon, recipe is very good.