i agree, 9 days means that water will be the biggest problem.

use heavy water bowls on the cold side, so that it lasts as long as possible before its all dried up.

i think with one checkup right in the middle it can work. cleaning and re-filling the water bowls and checking if the equipment is working will be the most important thing. 4 days, then a checkup, then 5 days.... should be possible.