Minecraft wiki entry for Cauldron, associated text: In Bedrock Edition, a cauldron can hold normal potions, splash potions and lingering potions. Using a potion on a cauldron empties the potion and increases the level of the potion in the cauldron by one level. A glass bottle can then be used on a cauldron with a potion in it, filling the bottle with that potion. This reduces the potion in the cauldron by one level.