There is a nonelectric product called Snugglesafe for dogs you might use. This is a small plastic disc, about the size of a salad plate, that you heat in your microwave for a few minutes. It stays at 55 degrees for many hours, like 8. I have one for my dog and it really does stay warm a long time.
You could put a heated Snugglesafe under an insulated watered first thing in morning and in eve. Start with warm water, too. Insulate under and around, even with just shavings, hay, old jacket, anything.
I have used super-thick rubber buckets, filled with warm or hot water, and set inside a bigger bucket packet with insulation. It takes many hours for these to freeze. Chickens can drink fine out of regular buckets, but these are also available in pans. You can also get the ice out of this thick rubber without destroying the bucket.
You can float a disc of styrofoam (maybe tape off around edge), cut out of an old cooler lid, to cover some of the top of the bucket or pan, to further reduce heat loss.
Farmers kept livestock of all sorts successfully in freezing areas long before electricity. Chopping out ice used to be a normal chore.
You could put a heated Snugglesafe under an insulated watered first thing in morning and in eve. Start with warm water, too. Insulate under and around, even with just shavings, hay, old jacket, anything.
I have used super-thick rubber buckets, filled with warm or hot water, and set inside a bigger bucket packet with insulation. It takes many hours for these to freeze. Chickens can drink fine out of regular buckets, but these are also available in pans. You can also get the ice out of this thick rubber without destroying the bucket.
You can float a disc of styrofoam (maybe tape off around edge), cut out of an old cooler lid, to cover some of the top of the bucket or pan, to further reduce heat loss.
Farmers kept livestock of all sorts successfully in freezing areas long before electricity. Chopping out ice used to be a normal chore.