I wish you would call and report them. You have to have a local animal shelter that could help you with this. Try calling a nearby veterinarian, even, as they should be able to point you in the right direction.
These hens are being abused while you aren't there to take care of them. They're not in a safe environment. If, for any reason, you are unable to look after them they'll go right back to suffering from thirst and hunger. I know it can be tough to make waves when you're a teenager, but I think it's important that you get this into the hands of adults who can take real action.
As someone mentioned earlier, you might even be getting yourself into trouble by feeding them/going into the run.
It's very good of you to look after them- I'm sure you're a welcome sight to those hens! But at the same time I feel that's only a temporary solution.