Minecraft wiki entry for Advancement_guide, associated text: Fill 3 glass bottles with water (from any water source or cauldron). With just 3 water bottles and a certain ingredient, you can brew awkward potions, mundane potions, or thick potions. Thick potions and mundane potions have no use, so it is better in the long run to brew awkward potions, because they are the basis potion for nearly all other potions.