How do you repair water stained walls & popcorn ceilings?

you need to be sure there is no mold before painting or doing repairs - if there is mold then you will have to call someone in to take care of this for you - if no mold, paint with a stain killer such as Kilz product then paint over the primer

I don't live in hurricane territory so I don't know for sure, but it seems to me that the water that stained your walls would be tainted with unwelcome bacteria. I do know that my brother & sister-in-law were hit with Harvey and they had to rip out all stained dry wall. In addition, the studs and other wood behind the walls probably got wet too. That is a breeding ground for mold as far up as the roof, because water coming from the roof doesn't always come straight down. It follows the beams. I really think you should have a professional look at it before you do anything. This is just my opinion. I wish you the best & hope the New Year is better for you.

I would think I would have ripped out all drywall immediately to prevent mold, this would have been covered by your homeowners insurance. I would cut out a few sections of drywall in that area and check for mold on the back of the drywall and the wood. before any repairs are made.

Check your homeowner's insurance to see how long you can file a claim after the storm.

You need to rip out the stained wall to be sure you don't have mold growing and that you don't have anything leaking from inside the wall. Popcorn ceilings are something many folks want replaced. You need to wet the ceiling and scrape the popcorn stuff off (see You Tube). Be sure to check above the ceiling to see if you have any leaks.