A murky brown liquid in a small vial, brewed from bitter roots and herbs. Drinking it grants a temporary boost to endurance, reducing exhaustion by one level for 1 hour (does not stack). Costs 5 gp per vial, but the taste is notoriously foul.
Recipe
Boil 1 ounce of dried
bitterroot
in 2 cups of water for 20 minutes.
Strain the liquid and add 1 teaspoon of crushed sage.
Simmer for another 10 minutes, then cool and bottle in a sealed vial.