Potion of Healing

To make a Potion of Healing (4hp), you first need to make an awkward potion

after the awkward potion is finished put a glistering melon slice in the top slot and wait for the healing potion to finish

For more Healing (8hp), put a piece of glowstone dust in the top slot and the potion of healing in the bottom slot

If you want to make a splash Potion out of it you simply put a piece of gunpowder in the top slot

And if the splash potion is not enough for you and you want to make a lingering potion from it, then you just put a bottle of dragon´s breath in the top slot and the splash potion in the bottom slot