The only thing you can put in a cauldron is water.
You do this by right-clicking on it while holding a water bottle.
To make a splash potion, take a regular potion and put it in the bottom slots of a brewing stand. Then, put a piece of gunpowder on the top slot of the brewing stand and it will convert the potion to a splash potion.
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Netherwarts is a key component in potion brewing. I suggest going to the minecraft wiki for more detail on potion brewing.
combine magma cream and the awkward potion
to make an experience potion in Minecraft: Brew an Awkward Potion (Nether Wart + Water Bottle) Add Glowstone Dust to the Awkward Potion This will create a Potion of Experience that grants a temporary experience boost when consumed.
Water bottle+ Neather warts= Awkward potion Awkward potion+ Spider Eye= Potion of poison Potion of poison+ Gunpowder= Splash potion of poison
Well first off you should check the minecraft wiki. Second of all it's rather simple, first you need to craft bottles and fill them with water. Then you get put them in one of the three bottom slots. You will need to then put the ingredients on the top slot of the brewery to make a potion. You need to find specific potion you want and then receive the ingredients for it to craft it. Minecraft Wiki has more information on it.
There are no instant kill potions in minecraft at the moment, just potion of harming, which can do 3 or 6 hearts of damage.
The ID for the splash potion of harming II is 373:16428
you don't there is none
In your brewing stand, start with turning the water bottles into awkward potions with nether warts. When that is done, put a puffer fish in to make it into a water breathing potion. To get pufferfish, make a fishing rod and just fish for a while and you can randomly get them. To make the potion last longer, put a redstone dust in.
you go to the cannon, put the potion in and shoot it.