It uses a spring action valve instead of the ordinary ball tube to prevent leaks. It's called a QUICK LOCK - FLIP TOP Water Bottle. It makes for easier cleaning cuz you don't need a special brush to get into the bottle for a thourough cleaning like with the regular bottles. You can find them here http://www.bassequipment.com/manwater2.htm.
You should also look at the automatic watering systems. The same site has several options for the automatic systems too.