I had an unusual day. It is cold--low of 15 and high of 27. I work up, gave the birds their food and water for the day, then drove off to help a friend, and didn't get back until after dark. They were all roosted already, so I locked the coops and carried the extra food inside. I noticed the water was frozen solid--i has thought their drinking during the day would keep the ice from forming too much. I was wrong--the ice was completely frozen--a four inch high iceberg. I am wondering if I had neglected my birds and brought harm to them. Can chickens survive 24 hours with no water? Should I take water to them now at 10;30 pm. ? Suggestions?