Next, you need to turn on the water by pressing the red button located across from the bush with the berries that makes you burp.
Go back to the house and stomp on the button on the ground, then click on the water pouring out of the triceratops. (Klay will drink some.)
Finally, press the doorbell and listen to the sounds that the pipes make. Click on the other set of pipes and spit water into them to match the sounds that you heard.