I have seen so much lately about what to put in your chicks' water, how much, runny poop, etc., I think I need to interject something here. First of all, do you know what I put in my new baby chicks' waterer? WATER. That's it. Just fresh, clean water. Even if they have been shipped, unless they seem stressed, they really do not need anything in their water. Sure, you can put a small amount of plain sugar in it to give them a boost, however, if you put too much or continue it more than a day or so, you will cause them to have runny poop. That said, some runny poop is normal for tiny chicks. They have several types of poop and some of it is not solid. If you have a problem with pasty bums, do this: find organic apple cider vinegar, with the mother of vinegar. It has the sediment on the bottom of the bottle. Put maybe a tsp of that in a full, quart waterer. That will be all you need to do. DO NOT ADD ANTIBIOTICS to your chicks' water for any reason at this age unless someone knowledgable has properly diagnosed some bacterial infection, which would be very rare in a newly hatched chick from a hatchery. Antibiotics usually cause loose poop so that will not help and will start them on the road to antibiotic resistance. When I received my first chicks over a year ago, they got nothing in their water. Period. They ate only high quality chick starter for the first couple of months before receiving any treats at all. They did not get grit until such time. I have not lost one single bird. Not one. No illness. Nothing. So, please do not begin by medicating these tiny, tiny chicks indiscriminately. Just wanted to help you avoid causing them problems when I know you only want to help them get a good start.