I was joking, when we were out late at night, we were not drinking water, but rather an alcoholic beverage.
Mine does not have water in the coop, I have at times tried it, and wound up with a mess. I do have a shelter in the run, and during inclement weather, I will put it there.
If you can provide open water everyday, it is probably an advantage. I cannot, and really see no loss. They do get liquid water each morning, and many will be taking a pretty good drink at that time. However, in really cold weather, that freezes up quick. Lucky for me, while we will get a could of very cold weather, it generally only last a few days and then gets nicer.