This really is a good idea. I get it! I'm in Central Illinois and it may get below zero wind chill but not that often actual temps. I am going to try this for sure!"I live in northern Sweden and we have some very harsh winters here.
i have 17 chicken which are thirsty even if it's -30°C cold.... My design works really well, is inexpensive and easy-build.
It prevents the water from freezing until -10°C without any heating source but all temperatures below that you'll have to start the heater." https://www.instructables.com/isolated-watering-place-for-chicken/
This is spray foam insulation between a fountain waterer and a bucket placed upside down over the fountain. Pretty good explanations and pictures.