How do I make water breathing potion in Minecraft?

To make a Water Breathing Potion in minecraft, you'll need a Brewing Stand, Blaze Powder (to fuel the stand), and the following ingredients: a Nether Wart and a Pufferfish. Start by placing a Water Bottle in the Brewing Stand, add the Nether Wart to create an Awkward Potion, then add the Pufferfish to make the Water Breathing Potion. You can extend its duration by adding Redstone Dust during the brewing process.