The container your plant is in, if it has holes in the bottom, you just place it in another container without holes in the bottom. Then you fill the bottom container (water tray) with water up a little bit so the soil is constantly damp. Many CPs love to be constantly damp. The holes in the bottom of the pot your plant is in will allow water to always be in the pot. You can use anything that holds water (like vft guy showed). I have used some pretty random stuff also, like the bottoms of the distilled water jugs I get.