Thanks for passing on what I know I’ve posted several times before. The “cooler” water bucket works really well if you use the styrofoam float on top. I kept my horse’s water open down to 0F overnight with that rig when I lived in NY. I did use warm water in it at night to make it last longer.
A word of warning…if it does freeze…be gentle breaking the ice loose…the styrofoam will shatter easily. I preferred to use more warm water if it froze over.
I have also insulated 30 gallon trash cans using hot water heater insulation and bubble wrap…tape it well to keep it on the tub. I also used a styrofoam float on that. Worked like a champ.
I’m about to try this on my stock tanks as soon as the weather breaks a bit and I have a bit of time here on the farm to do it.