The water bottles I've had the best luck with have been "Water Buddy" bottles...they don't have the little balls at the end, instead they have a little lever that the rabbits push down with their tongues to get the water to start flowing.
I have 3 of those bottles, one of them is pretty old, and none of them leak. I also like they you refill them from the top, so you don't have to worry about breaking the seal every time you need to refill them and they are easy to refill without removing them from the side of the cage.
However, the company that makes them stopped making them awhile back so they are kind of hard to find now. Amazon still has the smaller size bottle and I was told that you can sometimes find the larger size on Ebay, but that's kind of hit or miss.
I switched to using automatic bowls recently because I hate cleaning out the inside of water bottles. The automatic bowls, for me, combine the things I like best about bottles and bowls. They are easy to clean thoroughly, but hold a lot of water so I don't have to refill them a million times a day. They are heavy so the rabbits can't tip them and spill the water, and because they hold so much water I can go out for a day without ever having to worry that the rabbits will run out.