You can use glow ink sac on the water/potion to make it glow the same way you use red dye on the water to make it red. It doesn't make the whole cauldron block emissive, just the water/potion inside. Kinda like how using a glow ink sac on signs makes the text emissive not the whole block. Potion particles emitted would also be emissive.
Disclaimer: You can't take glowing water from a cauldron with a bucket and place glowing water, just like how you can't take red water from a cauldron to place red water. This is not that kind of suggestion. The glow ink sac would have no effect on the potions either, it only makes it emissive in the cauldron
Other than being glow-in-the-dark, the glow ink sac would be useful in fully bright settings as well, to brighten up the water/potion because even in bright settings, water/potions looks rather dull in the cauldron.
Glow ink sac could be used to highlight a cauldron for players, or to see what color the water/potion is when its too dark. It can be used creatively to make water appear magical and enchanted, or look like radioactive waste. It could make a bubbling cauldron of potion spookier or more intense.
On Java, this effectively means you can make only water glow in a cauldron since you can't dye water or put potions in cauldrons. But i'm sure Java players could still do a lot with that.
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