Everlasting Vial (Slinger)

Description (Slinger)
Everlasting Vial

Legendary item. When filled with a potion of Uncommon or lower rarity, it will magically refill with one dose of that potion once a day. This vial may be cleansed once a week when empty to switch to a different potion.

Reference
Chapter 39 "Rude Awakening"