Best substrate for ball python?

I have a baby ball python, at the moment shes in a 10 gallon tank with her hiding rock and her water dish. Im using this coconut husk substrate, with frog moss if i need it to keep it humid, it might be that i live in Arizona, but I have to heavily mist her cage until the soil is quite wet, at least twice a day to keep the humidity level to at least 50%. The moss even gets dried out after like 4 or 5 days, so im changing the tank every week. Im a little weary of using newspaper because its been everywhere outside o.0 But whats the best stuff to use as substrate? Also, should I be worried that ive had her for a month and she hasnt shed? Thank you :D