I did have aquariums in the past, and until I got the water issues figured out, I lost many fish ? True, some of the water conditioners on the market are junk, but PRIME is the only one I would trust.
That being said, I'm absolutely sure you're right about distilled water being the best and the safest thing for the mister and dripper too.
The reptile stores around here sell PRIME and since newbies don't know these things, and the book that comes with the Mister says use de-mineralized water OR distilled, it's an easy mistake not to give it a second thought.
NOW, with THAT being said, that raises another question ? if tap water is unsafe for my Cham, even with Prime, how is it safe to hydrate him in the shower (weekly if needed) , when that's just straight-up tap water?! ?
I didn't say, or mean that your tap water is certainly unsafe. Just that it's hard to know, if it's safe or not. There is no one size fits all. My water use to be, likely more so safe than it is now with the issue I described. My local water has started using Flouride too. Which is a concern to some. Really have to investigate, your Tap water, what they add, what it's polluted with ect, and judge.
I don't use Distilled, I use a RO system. And I use RO, water. It's cheaper in the long run, and easier to deal with.
As to the shower thing. I have no answer as that is not a practice that I do personally. Nor understand the requirement, or reasoning for it. I just have a longer mist on Sunday afternoons.
As to the Prime. I didn't mean it doesn't work. I am sure it is a great dechlorinator, as well as may destroy bacteria and some others.
What it will not destroy is polluted, as in my case now due to a local dry cleaner. With soap and chemicals. Nor will it remove heavy metals such as Flouride, which is a toxic metal that is good for our teeth, and only mildly toxic, so they feel it okay to inject our water with it.
It's toxicity to reptiles, is debated as it is to humans. So depends what side of that argument your beliefs lie. That is not something I can answer for you, as both sides make good points.
I can provide my thoughts, which are that I do not drink nor provide my reptiles or even my insects with Flouride water. As while both sides make good points, I would rather err on the side of caution.