2 liters of water isn’t excessive.
So how much fluid does the average, healthy adult living in a temperate climate need? The U.S. National Academies of Sciences, Engineering, and Medicine determined that an adequate daily fluid intake is:
- About 15.5 cups (3.7 liters) of fluids a day for men
- About 11.5 cups (2.7 liters) of fluids a day for women
These recommendations cover fluids from water, other beverages and food. About 20% of daily fluid intake usually comes from food and the rest from drinks.
In both cases, 2 liters of water is closer to what you should be drinking.
The paper did not suggest that that is the amount you should be drinking. It had based the adequate daily fluid intake on the median total water intake from US survey data. “In this setting, the AI should not be interpreted as a specific requirement.” AI (Adequate daily fluid intake). “… on a day-to-day basis, fluid intake, driven by the combination of thirst and the consumption of beverages at meals, allows maintenance of hydration status and total body water at normal levels.”. Just drink when you are thirsty and you should be fine. But you do you.
