I agree, humidifiers are a must. I don't use one during the summer, it gets around 70 or 80% here most days, but in the winter i have one running a lot.
I don't use a mister, I live in an apt and can't afford to have it break. I hand mist really well once daily and also give her some water with an eye droper once she starts to drink, then i mist quickly one or two other times during the day for moisture. Some weeks she just won't drink even with the misting so i put her in the shower. She's been strange with eating and drinking ever since i bred her last year. I also have a dripper but she doesn't seem to like it. I would say that it depends on your chameleon. If you can get it to use a dripper that would be enough water then mist at night or have a humidifier on a timer depending on your climate. You can fill the dripper up before you leave for work and it should run for a good 1/2 hour or hour depending on it's size. Your cham should learn to drink when it wakes up, and also you can fill it again after you get home. Just set it up on something and have a stick that goes near the drip, then put a dish under to catch the water. Just keep an eye on his/her urates to make sure it isn't dehydrated.
There are a lot of strict rules it seems, but there are many many different ways to raise chams. you just have to be careful and keep an eye to see how your animal is doing with the husbandry you provide.
~Lindsay