So while I was at the pet store this weekend I noticed they were cleaning the enclosures so I went and watched. They were spraying the cages or whatever their called with something in a spray bottle. Not misting but literally drenching everything. I thought it was some sort of special mix because i noticed all the pet stores sell a special spray to raise the humidity in the tanks. i asked the guy what they used and he said its straight water. so my question which is better? water or the stuff they sell? and then how much should be used? im asking because sometimes it is hard to maintain the humidity in my tanks because we keep the house kind of cool. i put towls over half of the top of the tank which seems to help. but what should i be spraying?