Minecraft wiki entry for Advancement_guide, associated text: To make an awkward potion, first put the 3 water bottles in the water bottle lined slots. Then, put 1 nether wart, which can be found in nether fortresses, in the top potion ingredient slot, and put 1 blaze powder in the top left slot. This should give you 3 awkward potions in replace of the water bottles and nether wart. Once you get the bottles into your inventory, you will get the advancement.