This is another easy idea that can be put together in minutes. If you don't have ice cube trays, then the dollar store has them.
The Wee One laughed and laughed when I gave her this activity. She would touch an ice cube and shout, "It's cold!" She spent more time laughing and touching than actually putting the ice cubes in the tray. Mister and Ladybug were able to see the ice melt and we were able to discuss how ice changes into water.