Sorry to hear about Kevin's death. It hurts to lose a baby you've worked so hard with. *hugs*
In order to prep for a new snake, I would do two things. Given that you had a regurge, coupled with strange behavior (i.e. laying out) the fear of cryptosporidium runs strong in me, so I would throw out all of the porous things... i.e. bedding, paper towel hide, etc. Then I would take your ten gallon outside, put all of the non-porous decor in it (like water bowls, plants and any ceramic hides) and I'd use a dilute ammonia/water mixture to kill any possible bad bugs that may have got onto the tank. The other thing that kills crypt spores (not saying this WAS crypt, again, just that I am deathly afraid of it and would rather be safe than sorry!) is exposure to direct sunlight, so I'd probably put it in the sun for a week and let it bake.
Bleach can be used and will kill most pathogens... unfortunately crypt can survive bleach exposure and be just fine.
Once it's been scrubbed out and disinfected, you can set it up with a new paper towel hide, just like Kathy described. If possible, perhaps choose a different vendor or pet store. Sometimes petstores as a whole don't take great care of their snakes, or get them from sub-par sources, so perhaps a change in vendor will improve your odds.
The one sad thing about baby snakes is that they are not all meant to survive. Snakes produce loads of babies, and a lot of them in the wild would be food for other things. In captivity we do our best to give them all they need, but sometimes it just isn't meant to be.
I wish you luck with your next corn. Kathy knows her stuff. Follow what she says and you will be just fine.