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It might be enhanced by starting with a clear cup of ice cubes! Then they can relate to change of states. I've even left a clear cup of ice in front of the room first thing in the morning without saying anything about it. Once I see it's all melted, I walk over and say, "Someone stole my ice-cubes!" The students then tell me, "No, it melted." "How do you know?" They giggled about it and would make references to it whenever we would study states of matter. I can now add your step of evaporation to it. I would use a marker to mark the water level each day.
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