so his water doesn't freeze
Please remember the bottle snugs just help to stop the water from freezing fast but the water will still freeze, just make sure you check it twice a day.

I have two sets of water bottles what I do is in the morning before work I give them a fresh one and at night (by then it is frozen) I switch it with one I have hadd in the house, then I bring the one in the house and let it thaw over night, fill it in the morning and switch it with the one outside.......

and make sure you only fill the water about half way because when water freezes it expands and if you have the bottle full it will cause your bottle to burst.