what's the fastest way to make potions in minecraft?

the fermented spider eye is the other one people don't get. it flips a potion into its opposite, which is how you end up with weakness, slowness, harming and invisibility. and lingering potions need dragon's breath on a splash potion, so that's an end-game thing - don't go looking for it early. a cauldron fills bottles fine if water's a walk away.

brewing stand first - three cobble and a blaze rod - and blaze powder is what fuels it, so kill a few extra blazes while you're down there. then nether wart into water bottles to get the awkward potion. that step isn't optional and it's the one everyone skips: awkward is the base for nearly everything, and the actual ingredient goes in on top of it. redstone to make it last longer, glowstone to make it stronger, gunpowder to make it throwable. brew three bottles at a time as well, it costs the same wart and the same fuel as doing one.