The water bowl should usually be in the middle, in between the two hides, but you can put it wherever it helps maintain humidity best. The light will most likely leech all of your humidity out of the enclosure, causing other problems to arise, that's why heat pads are usually the best solution, because they help maintain that humidity and don't dry out the air. Not to mention much cheaper. Thank you WalMart A human heat pad WITHOUT auto shut off should cost you around $10 US(more if canadian). I found one at Target, an offbrand, for $10, so it may be cheaper at Wally World.

As for the hides, you can use the clay pot bottoms, or plastic circle trash can lids, pretty much anything, just so she feels secure in it. An opaque hide is best so they don't feel out in the open. If you don't feel she is warm enough, if you have a space heater, or anything of that sort around your house, that may be good to use.

Also, you can make humid hides out of nearly everything. While you're at WalMart, see if they have some suitable disposable Gladware containers. You can cut a hole in the side, place some moist paper towels, wash cloth, or sphagnum moss in there and place that on the warm side. It acts as a little snakie sauna and really helps with shedding.

Any other questions just ask. I'm glad I could save you some money, I know it makes me feel alot better knowing I don't have to buy every gosh darned thing at the pet store.