you can also increase or help stabilize humidity in a screen enclosure, by putting an acyrlic panel (preferably frosted or white ,not clear) all or part way up , one, two, or three, sides depending on the species you are trying to keep or the conditions you are trying to achieve, you can also just attach a kitchen trash bag on one or more of the sides,/ in any event clear (all glass or plastic ) enclosures are not recomended for starter setups (except for maybe some of the pygmies) and generally speaking, actual water falls (dry ok) are considered to be not good by most established cham keepers , if drinking water is the issue, there will be plenty available in any properly setup enclosure, (via dripper or mister ) i would recomend learning as much as you can about any specific animal (especially when it comes to chams ) before getting one