5/16th drill bit. Super e-asy just dont screw them in upside down like I did the first time :) I used both a 2 gallon bucket which and a bottle cap one on a heavy plastic orange juice container. I would recommend the white plumbers tape or silicone for the extra seal effect. Good Luck!
I'm brand new to this and have zero chicken experience. So, here is my 2 day observation with apple cider vinegar thus far: 2 Tbls in 2 gallons from the beginning in a plastic bucket with the red plastic water nipples(awesome by the way!!) chicks went right to the water on arrival. They have...