On Fabric/Quilt, GUI is available through Mod Menu
Changing config doesn't require restarting your game (or server).
On single player and LAN hosted worlds:
When using the GUI, clicking the "Save" button will sync with all connected clients.
When not using the GUI, change the JSON file and use the command "/potioncauldron config reload".
On dedicated servers, after changing the config:
Use the "/potioncauldron config reload" command on the server console.
OP players can also use the above command in-game.
Available configuration options :
Evaporate if different potions or liquids are mixed
ON: If a player tries to put a different potion or liquid (water or lava) in a potion cauldron, the liquids from both the cauldron and the hand will evaporate and disappear.
OFF: Item in hand is used normally.
Allow merging different types of the same potion
ON: Allows merging normal, splash and lingering variants of the same potion. Taking back the potion will give whatever type was put in last.
OFF: Applies whatever is set in Evaporate if different potions are mixed option.
It's how it works in Bedrock edition. For instance, you can put a Potion of Fire Resistance, Splash Potion of Fire Resistance and a Lingering Potion of Fire Resistance in the same cauldron. Picking up would give back 3 bottles of Lingering Potion of Fire Resistance.
Apply potion effects to entities standing inside
Allow filling with water drips from rain and dripstone
Allow creating tipped arrows and the maximum number of arrows for each level
Generate in swamp huts
ON: When a swamp hut (witch hut) is generated, a cauldron filled with a random potion, type and level will be generated instead of an empty one.
OFF: Generates with an empty vanilla cauldron.
The chances of the generated random potion, its type and level can be configured.