If your chameleon is at least 5 months old, you may also give it a 30-45 minute "shower" for extensive rehydration. Place a fake or real plant in your shower, position the showerhead so that the water hits the wall (not the plant! ), and make sure the water is cold (not lukewarm), and your chameleon will enjoy a fine mist. You can use this method again when it looks like it needs to drink more water.
For younger chameleons, try giving them a bath. You'll need a bowl large enough for them to swim in, a couple of cups of room-temperature water, and a soft cloth. Once their bath is ready, put the chameleon in the bowl and cover with the cloth. Change the water every hour for the first four hours, then once per day until they are eating regularly and drinking well.
Chameleons are usually given a medical exam by a veterinarian who specializes in reptiles to make sure they don't have any hidden problems that would make them unable to handle a bath. Most reptiles can take it without any long-term effects from being bathed; however, there are cases where they might suffer from skin irritation or even collapse from loss of fluid during recovery from surgery.
So if you decide to bath your chameleon, be sure to follow instructions carefully so as not to cause them any harm.
You may give your chameleon water by spraying the leaves in the terrarium with a plant mister. Do this at least twice a day. If you don't have the time to do this on a regular basis, you can get a dripper. This is just a water container with a little leaking valve attached to it. Your chameleon will then learn to associate drinking with getting wet from the dripping container.
If you want your chameleon to drink on its own without forcing it, you'll need to attach some kind of device to its mouth. The most common one is a sipper tube. These are thin tubes that fit into the corner of the mouth. They usually have an opening about the size of a pencil lead. Some sipper tubes are made out of plastic while others are made out of glass. Both have their advantages and disadvantages. A plastic sipper tube can be replaced if it gets broken or if you ever change your chameleon's food regimen. As long as the hole isn't too big, a plastic sipper tube won't cause any problems either. However, if you use a glass sipper tube, you should be careful not to break it when removing it from the chameleon's mouth.
There are other devices such as straws, wires, and magnets that can be used to force chameleons to drink.
Place her on a plant in a shower that is cooler than bath water but slightly warmer than room temperature, and angle the shower spray against the wall so that the water bounces off the wall and splashes the plant and the chameleon. Leave her in the shower for 20-60 minutes on a regular basis. Purchase a misting system!!! This will help cool off the room while still giving your chameleon a drink.
If you don't provide an environment where she can relax and escape anxiety and stress, she may continue to exhibit these behaviors at inappropriate times. For example, if your chameleon is used to relaxing in the bathroom after you've shaved him or her, then they may continue to show anxiety about being shaved when there are no appropriate times for doing so.
Make sure that your chameleon has access to a suitable habitat that provides them with space to roam around in and make their own choices. This would include trees, plants, rocks, and other chameleons. Give them a large area to explore so they feel like they have some control over their environment.
Make sure that you do not give your chameleon any harmful substances to eat or drink.
Dripping water onto a leaf in front of the chameleon has worked for me. You may also encourage them to drink water from the spray bottle's nozzle or drips from the end of a huge plastic syringe. It will most likely take some time, but it will be worthwhile if the chameleon drinks.