I use a purchased water tray that comes as accessory to cage. At Lowes or HD but a drainpipe tailpiece and some plastic epoxy in glue section. Glue the ring onto bottom of the drain pan, let dry. drill a few small hole through pan in center of ring. Screw pipe onto ring and voila! a waterproof...
Got first ever teal hornworms for my 1 yo ambanja panther Ziggy today. He hit one immediately, looked like he was going to puke and spit it out on bottom of cage. More money well spent!