Great idea but, in my opinion, the clear plastic bottles that contain juices, soft drinks and bottled water can be a problem. Manufacturers often add different chemicals to plastics to give them the exact characteristics they’re looking for, like flexibility, strength, and reduced production cost. These components can include phthalates, bisphenol A (BPA), polybrominated diphenyl ethers (PBDE) and tetrabromobisphenol A (TBBPA) — all of which alter hormone expression in nonhuman animals and humans. The chemicals can leach out into the liquid and the process is speeded up when the bottle is warm like during the summer months. It's not got for your chickens and it's not good for you. It's best to do some research and know what you have. Below is a link to get you started on how to recognize safe plastics.
Good luck!
http://io9.com/how-to-recognize-the-plastics-that-are-hazardous-to-you-461587850
Good luck!
http://io9.com/how-to-recognize-the-plastics-that-are-hazardous-to-you-461587850