I did something similar for a deep freezer I had in my garage. I drank half a small bottle of water then froze it sideways. After it was frozen, I put it uprigh

I did something similar for a deep freezer I had in my garage. I drank half a small bottle of water then froze it sideways. After it was frozen, I put it upright and in a place it can't fall over. If the water goes flat to the bottom, then I know the freezer was powered off.