This would be good for a lesson on sin. First, Jesus took away our sin (the bleach makes the red coloring disappear). Next, Jesus changes our hearts and makes us not want to sin (our hearts are clean, clear water). Last, if we make a mistake and sin leaks in (at the end when the color swirls, doesn't mix in and then disappears), we remember that Jesus paid the price for us and that He promises to carry on His good work in us to completion.
Plant an Easter Garden. Collect rocks, moss, sticks, and flowers to make an Easter scene. This one has a buried flower pot to create the tomb and grass seed planted over the top. Help your kids understand the Easter story.