Hi...newbie here. I have four ladies in a 4x5x6 coop and the weather has dropped below 32 degrees a few times in the last week or so. I bought a standard heated pet waterer and put a smaller plastic jar waterer down inside of it. My thought process was that they would quickly fill the pet waterer with the coop shavings. Problem is that the chickens don't seem to be drinking as much. I'm worried a bit. Any thoughts or suggestions?