I made a goof, froze my engine block

Ok so I was doing repairs on my car chasing a leak, and I didn’t want to use antifreeze cause I don’t have the money to waste so I was using water. well over the weekend we got freezing temperatures and now everything in my engine block and my radiator is frozen. I’m trying to figure out how to thaw it because it will not start and won’t be back above freezing temps for the foreseeable future. short of lighting a fire in a hole that I’ve dug underneath the engine, I’m lost. Are there any other suggestions?