Algodoo

This is my first scene where I use scripting (I think it's cheating).
Anyway, it does have some water spawners. Drag water balloon skin to the pipe, until it's deep inside in the skin. Then, press enter (don't hold, just a gently tap would do).
When it's full of water, you can drag it to the catapult. Use right shift to shoot (again, just a gently tap or balloon will pop, it will also pop if it's too full). It should fly to the tower and pop. After that most of the water will disappear, becouse there are some killers on the ground. This lets you drag more skins to the filler.

And remember, head thing of this scene is water filling machine, so if you want tell critic don't say anything about catapult or tower. They're there just for fun, I made them in a hurry.

Have fun!