What I experienced on a 7 day water fast

Interesting, though I'd not recommend forcing a water fast upon yourself, more risky than food fasting. Also reading, "I soon conducted my own research and watched as many videos about it as possible and sought out personal anecdotes. Who am I kidding, Reddit was my source of truth (j/k)" Do consult with a Doctor and not just somebody on some abstract forum that may or may not be a Doctor. Everybody is different, what works well for one, ends badly for another.

Also going without water has a quicker and more serious impact upon the body over a shorter period of time than going without food. I'd personally not advocate it at all, but again emphasise that you consult with a Doctor before going on any such exercise. [EDIT ADD] https://www.medicalnewstoday.com/articles/325174.php adds some perspective and talking death here, so don't do it.