This is amazing. I have the same duck dish I think it is for concrete but it is their summer dish. I'm surprised you don't have more ice formed with all the duck splashing.
Figured out a bunch of stuff to buy on Joann fabrics for their Wednesday sale. Last night before I went to bed the cart emptied without warning so I had to find it all and enter it again. I got up at 11, the sale starts at midnight, to find my laptop had shut off. Turned it back on, thankfully the cart was still saved. Then laptop died and won't turn back on. Pretty sure god does not want me to make more pillowcases.

Our temps are not as severe as yours, of course, so ice is easier to control here.
They only got a bath on "nicer" days...sunny, less cold...when I was around. I keep that brick pad around the spigot cleaned off and the sun warms the brick a bit. I would scoop out the water to dump away from the brick pad when they were done. The container was then rinsed and stored inside. I no longer have the Muscovies. I enjoyed them but didn't like having to keep them with my chickens. I would consider them if I ever had to live where I couldn't have my chickens.