Good afternoon everyone. So my grandmom has a fairly large flock that is divided into 3 pens. 1 house is a very large turkey wagon as we call it with brahmas and giant cochins. the second is a large coop for standard chickens and a smaller house for bantum chickens then she also has a really small coop from tractor supply for chicks. (currently no chicks in it) In each house she uses sand as bedding which she cleans thoroughly every day or every other day. She is currently treating several for respiratory infections with tylan 50 @ 3 shots a day. My question is, is there a better antibotic to use that can go in the water and treat everyone instead of treating 1 then another then another which has been the issue all summer long. I wanna see if we can treat 1 good time and knock it out from everyone instead of keep having to give them shots. Shes getting really sick of having to treat constantly it seems never ending. Any advice would be seriously appreciated.