yea, i don't keep food and water in my coop. they don't eat or drink at night anyhow. just be sure to be up and open the door for them at daybreak though.
that's where i purchased mine as well
here is what i used to seal the roofing:
http://www.lowes.com/pd_97559-1115-2214___?productId=3048079&pl=1&Ntt=tuftex