I doubt they're giving him water other than the saline for medications and whatever they're using as mouth swabs. Maybe running a drip at "keep vein open" rates to deliver medication, but that's not enough to keep someone hydrated. It'll be either today or tomorrow I bet if he hasn't been conscious for a week. My experience with hospice usually makes folks that keep running for that long hard to even get a blood pressure reading on. But they keep on ticking sometimes.