Sorry...I know nothing of the auto-waterers you're talking about. But I want to assure you, that especially with only four birds, there's really no mess involved with keeping a waterer inside. Set a standard waterer up on bricks or something to make it chest level or so. With only four birds, the water would last for several days before needing to be refreshed. I do agree with others - if you're an early riser, keeping a waterer inside shouldn't be needed. But if you like to sleep in on occasion, well...it's never good to be thirsty. And with the warm/hot weather season coming, even moreso.