I use tap water...and it works fine. However, I do use Repti-safe to remove chlorine and other toxins. Trust me...it's cheaper. the humidifier is around $35-$40 while any pump that's gonna produce enough pressure to squeeze the water out of the nozzles is going to be $100 . PVC pipe will cost you no more than $5, "t" joints and elbows and caps are about $0.50-$1.50 each, and a good timer (top of the line) is about 20 bux. You'd have to buy a timer anyways...so that is just necessary. Misting nozzles are a couple of bux a piece. But with any type of pump, you'd have to have a converter to change the size of the tubing (you don't want to use PVC for a misting system, it's much more difficult to work with). and those converters (the whole brass one changing from an approximate 7/8" to 1/4" is about $30). AND if you live in a high humidity area, you won't have to have the timer on as much, thus less filling the tank. Misting system is gonna run you anywhere from 200-500 dollars and you'll spend under 100 for the humidifier. TRUST ME...I've done everything in the book...drippers, foggers, misting systems, bubbling water, daily misting, weekly misting...blah blah blah. This system is the way to go. If you're interested, I can email you pictures to show you how mine is set up and if you give me the cage size, I can give you the materials to get from Home depot to construct it. Email me at creed_ggd@yahoo.com and I'll help you out. AND ANYONE ELSE FOR THAT MATTER!!!