I would agree that 9 is too late but if that's what works for you and your family then continue doing it. It does sound like he can't wind down once he gets in to bed and that's why he's getting out of bed, asking for water etc...because he can't fall asleep. Have you heard of something called Calms Forte? It's made by Hylands (most people are familiar with their teething tablets).
"Temporarily relieves the symptoms of restlessness, sleeplessness, night terrors, growing pains, causeless crying, occasional sleeplessness due to travel and lack of focus in children"
It is all natural 100% natural. I have this in my house in the adult strength for times that my husband and I have trouble falling asleep and I discovered it for kids.
My son recently has had trouble napping. He lays there for 2 hours but cannot fall asleep even though he's so tired. I see him trying to relax but he just can't fall asleep. For the past week I've given him 2 calms forte kids before his nap and he's not only napped for 2 plus hours but he's fallen asleep with in 20 minutes every single day.
This has been a life saver for us. It does not make him drowsy or lethargic or anything it just relaxes him to the point that he can fall asleep. I've recommended it to 2 of my friends in the past week and after trying it with their kids both of their kids are now going to sleep on time and doing great.
Best of luck if you decide to try it.
A.