Humidity!! Help!!

[mango]

I've come up with an idea. My baby girl is in shed right now and I'm misting her cage up to 5 or 6 times daily in order to keep her humidity at 70 or 80. I somtimes don't get the chance to mist her enough so I've had a though and I want to run it by everyone. I was thinking that I could cut in half a brand new O-cello dishwashing sponge, wet it, and put it under her water bowl. Is this a good idea? Oh, it will also give her a hide on the cool side of the cage as well. Opinions please!!!