As far as I know at this stage it is impossible to get water into the Nether. I know it could be done in previous versions with silk touch and ice, but that is over now. And in the new versions silk touch will work on ice, but breaking ice in the Nether will not give you water.
So I am looking for a good setup so I can make some potions in the Nether, mostly instant health, splash damage, and speed potions.
One solution I often read is bringing filled water bottles into the Nether, but that is just a 1-1 solution, I do not like that too much.
I was thinking of the following setup. I fill a chest in the Nether with water buckets, and one chest with stacks of all the ingredients I need. Than in the brewing station I have a cauldron. Now if I understand correctly with a filled cauldron you can fill 3 bottles.
So now I can bring buckets of water instead of bottles, so 1 inventory space will give me 3 potions.
One thing also is that when you go back you can fill all the buckets with lava.
Will this be a good setup, or are there more efficient ways to create your brewing station in the Nether.