So I am new to the chicken thing and still have a few questions...(should be getting some hens from a friend who is trying to down size her flock! free and already laying!) I am still building my coop (Ill post pics later) and I have a few 55gal barrels I am going to be using to collect the rain water off the roof of my house. so my question is, can I use that water for the chickens? or just use for the garden? I was told that the roofing shingles have fiberglass in them and shouldnt be used for animals? If I can use this water I have a few ideas on how to use this water to flow into my run...so I want to know if I can use it before I finish the coop and so I can put it in the right spot in the yard if I can/cant use it. thanks so much! this site is so awesome! so much info!