You can drink too much water. I ended up in the hospital from it, since I was drinking about 3 liters a day, including waking up in the middle of the night and taking a slug from my water bottle. My salts were already very low and then I did a walk in the heat and got home just in time to call 911 and survive the experience.
Drinking too much water washes the salts (electrolytes) out of your body (anetremia) and then you can go into a fatal collapse, shut down and die.
If you’re going to drink a lot of water, make sure it has electrolytes. You can get them in powdered form and sprinkle them into your water bottle.
Also, drinking a lot of water all at once after heavy exercise, heat exhaustion or even things like getting sick from food poisoning can overwhelm your system and cause it to go into a fatal tailspin.
So be careful...take this with a grain of salt, literally.
You can drink too much water, but three liters a day sounds very low to trigger such a problem.
Our tap water comes from limestone caves. When I was drinking filtered water, I start throwing PVC’s. I switched to tap water and it went away.