Here is what you will need:
-Red food coloring
-1 cup of bleach
First start by teaching your children that we come into the world as a baby, pure and innocent. The glass of water represents that pureness.
Next add a few drops of red food coloring to the water. This represents how our sins can make us unclean. Our actions such as being unkind to others can cause us to sin.
So how can our sins be forgiven and how can they be washed away and made white as snow?
Start by pouring a cup of bleach into the glass of red water. The cup of bleach represents Christ's atonement and the red represents our sins. Watch the red disappear before your eyes.
Soon the water was clear and pure again. The atonement really can happen that fast. God can change us in a blink of an eye. We just have to ask for his forgiveness and ask him to change us.
Teach your children how God sent his son to forgive us of our sins and make then white as snow.