A. To make water breathing potion, the primary ingredient is a pufferfish. You will need to make awkward potions first, so use some nether wart in a brewing stand with water bottles to get the base ingredient. Afterward, you can use the pufferfish to make the water-breathing potions. Once you do so, you can use Redstone to extend the length of the potions from 3 minutes to 8 minutes total.