Here's one about water use in AI. I don't know if it mentions "filtered" but it references "clean" more than once. It rightfully points out water use in the western USA is adding to an already fraught water rights situation. cee.illinois.edu/news/AIs-Cha....

Mit has a good article and it’s even mentioned in Bloomberg and Forbes but I haven’t read those yet and I’m assuming they somehow justify it, being capitalist slag mags

WRT clean/filtered - as I understand it, most of the water use is from evaporative cooling and I would assume that anything that isn't clean/filtered is going to be a cleaning problem later when the water evaporates

There’s at least one person who very specifically called out the use of either municipal or ground water that could otherwise be filtered into drinking water but I can’t remember the woman’s name, so I was hoping to find more.

My sense of it is that the most readily available water for cooling would be from the municipal water supply. But I don't have the reference either

There's also arxiv.org/abs/2304.03271

It's not specifically a.i. Servers have to be kept cool and data centers use a metric assload of water to do it. That water has to be as pure as possible to avoid corrosion. (source: am sysadmin)