Related, my tap water kills my ferns. I have to used distilled/reverse osmosis water on them, which I also switched to after realizing this.
On the other hand, distilled water isn't necessary to maintain the purity of your bodily fluids.
Unless it's a bit chewy it just doesn't taste right to me.
We've all got fluoride stains. And the water tasted like crap because it was mixed with excessively saline water to reduce both the salt and fluoride levels to something reasonable.
- Intravenous
- Inhalation (for things easily aerosolized)
- Sublingual
- Everything else (including intramuscular and subcutaneous)
This is often the preferred route for oral medications that aren't too bitter for people, because it avoids stomach acids. So if the thought is that people don't want it in their bloodstream from ingestion, it's probably already there.
That doesn't even get into the concentrations. Standard water fluoride rates is on the rate of 1 ppm, whereas toothpaste is typically well over 1000 ppm. The amount of fluoride you swallow as a by-process of brushing your teeth would far outweigh what you drink in a day.
Water is an essential resource. We really shouldn't be messing with it. Just deliver it to the customer as pure as possible.