this is one of the best water wall ideas i have found. really simple and let's kids turn the bottles to direct water different places. also keeps bottle caps to stop water! i am going to try this and use other containers too! would work well on wood too.
Colored ice cubes for water table play. This acitvity is a good outdoor activity. The children can have fun watching the coloured ice cubes melt into the water and change colours. Also experimenting with colour mixing, seeing how two colours mixed together in the water can create a different color.