http://www.bonappetit.com/recipe/overeaters-tonic
Muddle mint sprigs, turmeric, ginger, fennel seeds, and cayenne in a 4-cup measuring glass until turmeric and ginger are broken up into bits.
Add vinegar, honey, bitters, and 3 cups cold water; stir to dissolve honey. Chill until very cold, at least 1 hour and up to 1 day. Strain.