Very fun idea. I do think this puts the water argument into a bit more perspective. Your average person should drink ~3L of water per day, or about 22mL per 11 minute average-length chat that Quili quotes on their site. It's hard to pin down exactly how much water AI uses, but something on the order of 5mL per interaction seems reasonable [1]. So the people doing this are using about 4x more water than an AI model would. Of course, it does matter what happens to that water, whether it turns into water vapor or urine and how much of that water re-enters the water cycle, but it's an interesting comparison.

[1] https://www.seangoedecke.com/water-impact-of-ai/