I can see why you don't want to do that again!I had three of them, they all froze. They were the standard dog bowls..
I had to use a big stick to break out the frozen stuff, stick it in a bucket and bring it back up to above freezing, and refeed.
I'd sooner feed dry this winter than deal with that again.
I loved the ice cream buckets in the dog bowls, easiest winter feeding and watering that I have ever had. Combined with using milk jugs to carry out the water, it was a piece of cake!