Agreed with the above. Misting the cage and chameleon for 1+ minutes with a handsprayer usually elicits a drinking response (if the chameleon wants to drink, of course) and I'd mist daily. Also, maintaining moderate to high humidity (50%+) is a very important and often neglected aspect of keeping chameleons hydrated IME. In the US the common wisdom for years has been that chameleons need all or mostly screened cages, which indoors can often lead to very low humidity due to home heating or AC use. Cages with less ventilation (e.g., the Exo terra vivaria, or similar options) are better at retaining humidity while still providing sufficient ventilation. In many situations indoors, caging like this works much better than all or mostly screen designs IME. Folks in Europe have been doing this for years with good success, while such caging options have only started to become popular in the US in recent years.
cj