>I drink 3-4L a day

I dont want to doubt you but from my own experience that seems insane. Is there a medical/enviromental reason for? Do you take salt tablets as well?

I drink a single glass of water in the morning, 200ml and I have a .7L glass bottle because I dislike the way plastic tastes. But thats a hard maximum that I could tolerate drinking.

I've also had blood tests done that do not show any dehydration in the slightest so I'm just curious why/how anyone could drink that much water without poisoning themselves.