When my dad was a niave young man and got his first cows, he actually used insulation to seal up every crack/hole in the barn. My ole Ky bred grandpa told him he was going to kill the cows, they needed air movement in the barn. I lock my goats in the barn for wind protection, but pleny of holes for air movement.
Man, I feel your pain on the water. Granted, I only now have two buckets to fill morning and night, but I have to truck the water from my house to mom's since her water is undrinkable, even for the animals. Warm weather is fine , I have 2- 55 gal drums on a trailer, but winter, I have to carry 5 gal jugs every day.