Brew an Awkward Potion by placing a Water Bottle in a Brewing Stand with Nether Wart and Blaze Powder as fuel
Add a Glistering Melon to the Awkward Potion to make a Potion of Healing
Use Redstone to extend the duration only if making other potion types; it does not affect Potion of Healing
Use Glowstone Dust to make a Potion of Healing II for stronger healing
Use Gunpowder to turn the potion into a Splash Potion of Healing
Use Dragon’s Breath on a Splash Potion of Healing to make a Lingering Potion of Healing