Everyone gets a clean bin and a full container of fresh water. I feed the day before leaving and cleaning. On the way out, I check on everyone. As soon as I come home, check again, clean water and bins. Nine days for adults should be fine. If you have babies, you might want to have someone come by and feed them, but they should be OK if you don't have someone to do that.
When we go on vacation, we have someone move into our house to take care of the animals. We put together a list of things that need attention in our absence. The great thing about ball pythons is that they don't absolutely have to have attention every day. That is one reason they make such great pets.