I tried the cup and hole method, but it isn't very easy to control the dripping - if the plant that it drips onto gets sat on by the cham, the water can easily end up on the floor of the cage! I got an empty plastic sweet jar, adjustable valve and aquarium air tubing and made my own, much like others have done on here. As Amy lives in a glass terrarium, I used sucker clips to hold the tubing along the side of her cage so that it always drips in the same place. Although I haven't seen her drink drops off the end of the tube, I have seen her sit in the plant underneath the drips and drink when the drips land on her head! The other thing you will need to consider is how you are gong to catch the water!