If you’re not thirsty, you are drinking enough water. It’s that simple.
Drinking water even when you aren’t thirsty is mainly a fad that came about as part of the diet craze, because if you are continually drinking water, you feel more “full” and will tend to have fewer cravings to pig out on food. At least that’s the theory.
In sports hydration if you get thirsty you are behind. You have to stay ahead of that curve.
Water, good way to get your MIn daily requirements of flouride, chlorine and PFAS
I don't recall what started the fad. Maybe it was contaminated water somewhere, or something of that sort.
About water consumption, I read the rule and I'm sticking to it. Take your weight, divide it by two and that's how many ounces one should drink per day. I don't care what it is as long as it's liquid. I include soups.