I'm sure a lot of y'all are doing this, but I'm looking for some specific advice. I'd like to capture the runoff from my present coop in the barrel to use for my flock's drinking water, but I'm not sure if that's healthy. The coop has asphalt shingles as the roofing materials. Does this sound like a bad idea, or am I paranoid? It's conceivable I could re-do the roof (after the winter) with another materials. Any insights?