The amount of water I carry depends on the terrain, weather, expected duration, expected distance traveled, and expected exertion level.
Where I hunt black bears I typically will have 4-6 liters of water. 4 if it is cooler and 6 if it is warmer. It is rugged terrain. One time it was hot and humid so I threw 10 liters in my pack. I wish I brought more as I never felt that jacked up in my life. Drank 2 64-ource sports drinks on the way home. Then, and only then, did I take my first leak since I first headed out.