You will need: cupcake cases, mini pom poms (it really helps if you put one pom pom in each cake case before you start), a long box filled with water (or several boxes if you have lots of people).
Talk about people who keep us safe, just like Moses' mum tried to keep him safe from the Egyptians and then safe on the water. Are there any times when God has kept you safe? Who do you know who needs help to stay safe at the moment? (We had lots of suggestions e.g. homeless people, people who were going to have an operation, people who were going on a journey).
Invite everyone to take cake case with a pom pom in it and think about someone who keeps them safe or someone who needs help to keep safe. Either say thank you to God or ask God to help them. When they have prayed, ask them to float the case on the water as a sign of their prayer.