I have 8 barred rock chickens that are about two months old. Earlier this week I had two chicken that would just sit down in my coop and not walk. Then later that day one of the died so I took the other chicken out to isolate her. Now I afraid something could be wrong. My chickens aren't walking around and playing as much as they used to. At first I thought that they were dehydrated but they have a lot of water. I don't know if I should get them vitamins or if they're okay. There was a cold front that came in over the weekend do maybe that could be it too. I live in Florida so maybe they were used to the heat and then maybe this sudden cold is making them sick. Please help me, I don't know what to do.