I have experience with being habitually dehydrated and that is when my back pain was chronic. If you want to be better listen to Dr mouse. 100 ounces per day. And I’ll tell you the exercise to make it better. You must work the core to fix the core.
I know your pain. And it’s terrible.
They told me take 600 mg ibuprophen just to sleep.
You have sciatic nerve pain? In your lower back? Shooting down your leg? Or sometimes your leg may disappear and collapse? Oh wait, That was me when I was your age