Take into consideration the fact that many other things you ingest can contribute to your level of hydration. Realistically, all fluids count toward your daily intake, not just plain old water. You can count all kinds of water sources from a basic glass of water, to a cup of coffee, to the water content of the foods you eat. Apparently, the food we eat makes up about one-fifth of your daily fluid intake. So realistically, you’re probably getting more water than you think.

https://www.longevitylive.com/anti-aging-beauty/realistically-how-much-water-do-we-need-to/?