I so agree with this, my dh has mentioned many times why give fresh pool water daily or drinking water since they poo in everything, Well they can't help it and I feel better knowing i am doing everything i can to keep them healthy. To me it's just part of taking care of my flock the best I can.I have asked myself this question any number of times. My general approach is to err on the side of caution, and do things that don't take whole bunches of extra effort but might make a slight positive difference. Offering drinking water with less poo in it is that kind of thing for me. Just reduces to total bacterial load in what they drink during the course of the day.