Ah. My own sense of thirst is completely missing, so I almost never enjoy water. I just chug it like I’m doing a chore, so I tend to drink as much as I can put down without running out of oxygen or giving myself the runs.

I can drink off a liter at a time if I choose, but I don’t because that much water does actually reach the other end of the tube before getting absorbed.

So for full absorption I usually do half a liter at a go, ideally a few times a day. It’s hard to remember to though because, like I said, no thirst.