An activity to get cubs thinking about where the water comes from.
Give each six four cards card with drinking, cooking, washing, and toilet written on them.
Tell them to imagine that down the hall is a river that runs through four villages (we have four sixes). Ask them to arrange where they think their village should do each activity if the river runs a particular way.
They normally get the drinking and cooking first with washing and toilet after. Watch the realisation as one village's waste water flows to the nexts drinking...
Then ask them to imagine if it isn't a river but one pond.