When we replaced our fridge this summer we deliberately opted out of the water on the door option. The children slop and drop and we end up with our own personal swamp oozing down the door and into a puddle on the floor. We thought we'd forgo that this time around.
Stuart has an affinity for cold water so he set up a two container system in the fridge. For some reason this works. The children can use these without spilling but they still haven't quite got the system down. This bothers John to no end. I'll let the sign he duct taped to the containers explain how it works:
~The Water Nazi