Or…freeze a half full bottle of water and then turn it upside down.

If you have some of those freezer pops left (one or two of the gross flavors usually make through the summer) you can freeze it standing up and then flip it over, too. It will melt faster, of course, if the power goes out.

Or freeze some water in a cup and then add another layer of water on top of it with food coloring in itOr freeze some water in a cup and then add another layer of water on top of it with food coloring in it