I just started raising chickens. One of my hens started having watery poo, I asked my bf( who is way more experienced than me),and he said its normal. The other day she started falling over and her poo came out pure water, but she still ate and drank. I separated her from the others and she seemed fine. I returned her yesterday and in the am I found her deceased. I am now worried about the others. Does anyone know what this could be and if others are at risk? What can I do? Please help me, I don't want to lose anymore of my girls