Cauldron water becomes white when using texture packs

[Thwingerp]

When using programmer art, the water in cauldrons will appear white by default. It will also change the cauldron texture to the default vanilla texture when you do something to it you normally can’t in vanilla (e.g. dye the water)

[MehVahdJukaar]

Then you need to edit your texture pack to not change cauldron as they are likely overriding it's model