I prefer, if there is room, to use both sipper bottles and ceramic bowls. .. I agree that rabbits that acquire water ONLY from sipper bottles tend to be a bit on the dehydrated side. And water bottles easily collect nasty bacteria at the point of the ball (so should be run through the dishwater weekly ideally), do leak, and are not always dependable (can instantly drain out all their water if a bit of hay gets stuck in them) leaving your bunny really dehydrated all of a sudden. But bowls do tend to collect a lot of hay and debris... still, having both is a compromise that works about as best as it can.