I use the Rent-A-Coop nipples.
The key thing being to hand-tighten them so that you don't crack the bucket with the drill attachment.
And to remember that little hole under the rim to break the vacuum if the lid is airtight.
The key thing being to hand-tighten them so that you don't crack the bucket with the drill attachment.
And to remember that little hole under the rim to break the vacuum if the lid is airtight.

) but I do have a heater for a regular fountain waterer, you just put the waterer on top, so I could see if that works. It automatically turns on at 32 degrees. (Or maybe its a different temperature, I don't really remember)