"Most bottles leak a bit. What you do is fill it up, screw on the cap, and squeeze it till the ball is pushed to the front and water is being pushed out in a thin stream from behind the ball. Then flip it over while also unsqueezing, creating a vaccum. I have one for two of my guniea pigs (the third has a different type of bottle.) and my robo has one too, and it works awesome. I like the turtle, to see where the water level is, which is much easier then trying to find it in other types of bottles. If the bottle still leaks, which my guinea pig one does occasionally, put a dish that they can use to push themselves up to reach the water beneath it, or put a bird dish beneath it. It'll catch any excess water and eliminate problems."