Get a rubber tub to soak the chickens with cool water. Slowly immerse them into the tub and support their body You may discover that (larger birds) will stand in the tub on their own. Smaller birds may get a bit nervous.
Look up "chicken Gatorade". it's an all natural mixture of water, salt...
My coop is always morphing. Started with a 10x10 shed... Then got a "Rugged Ranch" outdoor coop from Family Farm and Home, and made it a 6x8 breezeway on the front to break the weather.
Then I found a used "Tartar" brand dog kennel with a roof kit for $200 on local Craigslist.... and attached...
I have a friend that talked to an older gentleman that raises chickens. The supposed comment was to add another rooster. Take it for what's it's worth. (shrug)