batting water around

I have 5 cats and my male always smacks the Petmate around, often knocking the top off and everything. He does this each time before he drinks, drives me nuts. Any suggestions? I have the large capacity unit and it is somewhat heavy but he is still able to beat it around and often the the lid, filter, etc are laying about.

tape.

or child locks?

My cat sassy does the same thing with the water if she is sleeping and hears you open a water bottle she is awake and wants that water. She loves playing in it and making a big mess. She has a habit of laying in the bathroom sink and turning the water on. Its weird but she can do it.