How does one drink the willow tonic?

I've been hit with a disease identified as the Big Pox, based on symptoms.
I've boiled up the willow bark and gotten filled up a couple of bark cups worth of tonic.
How do I then drink the tonic? The only option I have is to empty the cup.
Is there something else that has to be added to the tonic to make it drinkable?
I've boiled up the willow bark and gotten filled up a couple of bark cups worth of tonic.
How do I then drink the tonic? The only option I have is to empty the cup.
Is there something else that has to be added to the tonic to make it drinkable?