>1part water to 3 parts methanol solution, heat to 330 and let separate out the waste product as you do.
Why go so hot? Water boils at 100C (232F) and methanol at 65C (149F). Just go to 100C.
Also apparently you can extract it from grapefruit.
>The quinine can be easily extracted from the fruits by boiling a quarter of grapefruit and straining the pulp. The pulp or the juice of grapefruit helps patients recover quickly from fever, and it reduces the burning sensation that occurs when the body reaches a high temperature.