Have the little ones draw a picture of Jesus and the Disciples (the apostles) administering the bread and wine to the multitude. Have the big kids search these verses for words and phrases that match or are similar to the sacramental prayers. How many can they find?
The ordinance of the sacrament is too sacred to try to act it out or to replay the events in these verses.
Why did Jesus use wine? Why do we use water? What does the bread represent? Why do we need to remember the Savior's body? What does the wine or water represent? Why do we need to remember the Savior's blood?