Woke up to dead & sick young hens. Had just started feeding them regular layer mix crumbles, & using new bigger waterer (we didn't have to fill as often). We are on well water, so thought maybe water had soured & grew bacteria & made them sick. Went immediately for antibiotic mix from Atwoods & gave it to them in fresh water & put them back on chick crumbles w/antibiotic in it. Several drank medicated water like very thirsty. Others we made drink a little w/a dropper. While checking out their usual roaming area outside of their house, I found the old hard cement bag in the garage. They roam in & out when they are loose. The bag was torn open & it looked like peck marks on the old hard cement with some powder still on top. Now I'm thinking bad water wasn't so bad after all. Hope they don't all die. Anybody have suggestions of anything else I might do to help them? Thanks for any suggestions.