i know this topic has been exhausted throughout the brewing forums, but I haven't hear much advice/talk about #7 plastic. My wife bought some cheap three gallon water bottles from target for four bucks a bottle. The bottom says for water use only. My thought is....although most people say to only use number 2 and 3...I would think if it is safe for drinking water use... It could be used for beer as well. Any thoughts or advice with using number 7 plastic to ferment in would be greatly appreciated.