All you need is an empty soda bottle and male to male 3/4'' hose connector. Mine was $6.99 and my local hardware store is a bit on the expensive side.
Drill holes in your bottle with a small drill bit and let er rip.
Added bonus #1 if you hang it from a tree your kids will play in the shade.
Added bonus #2 you don't have to store the bottle when winter comes.
Bring on the summer!