https://www.washingtonpost.com/wellness/2022/12/06/eight-cups-daily-water-intake/

Why you don’t need to drink 8 cups of water a day

They found that a person’s daily water turnover was largely determined by their size and their level of body fat, which contains less water than muscle and other organs.

The more “fat-free” mass a person has, the more water they need. Since men tend to have larger bodies and less body fat compared to women, they generally use more water. “Men use more water every day because we have a bigger system to keep hydrated,” Pontzer said.