I actually just filled up a water bottle with warm water and poured it everywhere. The mulch holds in water very well because its mulch (earth material).
Watch out doing this, if you keep your bedding wet all the time, your snake will get scale rot. Use humid hides instead, and mist twice a day if you have to. Or do what I'm going to do, and swtich to a tub, I'm giving up on tanks, they are too much trouble.
-Joe
1.0 100% Het. Albino
1.0 Pastel
0.1 Fire
1.0 Pinstripe
1.0 Purple Albino Retic