Every one has great advise. I am going to add my 2 cents worth too. I placed the water dishes on top of hides this saves floor space and I have two water dishes on on each hide. It also gives weight to the hide so it won't topple over. My hides are upside down plant saucers (plastic) and the water bowls and smaller plant saucers that are ceramic glazed ones. I use eco earth and cyprus mix substrate that helps with humidity. I have very low humidity where I live. Now for my secret, ROCKS. I have two real rocks one in the enclosure and one out when the humidity starts to drop I soak the out one in water for a day then switch them you can bake them to sterilize them. The rocks are poreous and absorb water then slowely release it. It keeps the humidity up for 3 days or so then it starts to fall and I'll switch them out. I personally use raindow stone but fine textured sedimentary rocks would work too. Not too hard as they don't take up as much water. If it bubbles in water it will work if it just sits there like well a rock maybe not.
Alex