I have the feeling no water bottle is truly 100% leak free.
I just got a petco brand water bottle and it actually leaked a lot less (like a drop every few mins or so), however a lot of people don't suggest their retail bottles due to the leaking problem...I must have gotten lucky with the one I got.
I have used the lixit ones (I believe that's the type, its dark and light blue) with some success. However over time with wear on the bottles they start to leak from the mouth piece thing for them to drink out of.
If you're looking for a bottle that won't leak I suggest maybe trying out different types?
Or there is a trick I have used that does sometimes (Since it doesn't always work but has for me) work, where every time you clean the water bottle, fill it as wanted, but then the twist top piece let it run under hot water then put it on. This creates a tighter seal, and takes a little more muscle to get off again later on, but for me it has reduced leaking quit a bit. However, I am sure there are some water bottle gurus on here who may have found a real non leaking water bottle. I think it is just the luck of the straw when it comes to them, since they don't always leak but mostly do at least a little.
