Distilled water bath?

A bit of an update to a previous post I made about Luke:

Context: I have a five-year-old male who has been refusing food and losing weight steadily for some time now. I ruled out water conditions (0 ammonia, 0 nitrite, ~10-20 nitrate), temperature (65 F), PH (7.5), and impaction (he did eat and poop successfully once in the fridge, and has always been kept either on sand or bare bottom). Eventually the only causes left I could think of were parasites, bacterial infection, or some kind of internal failure possibly owing to bad genetics or just bad luck.

Here is my question: I took Luke to the vet yesterday, who was not familiar with axolotls but has worked with other types of salamanders. The vet prescribed Panacur, but also three-hour baths in distilled water in the event it is some kind of protozoa infection? I am not familiar with this treatment but have since found it discussed in some texts online. Has anyone else had experience with distilled water baths for axolotls?

Distilled or RO water is bad for axies. They like high hardness/mineral content, a low mineral environment will leach minerals from their bodies and they will eventually become anaemic and ill.

If anything you need a high mineral content for axies - try 20% Holtfreter's solution.