Are you reading the other posts?
In your climate you're going to want a heated waterer.
I use this,
https://www.backyardchickens.com/articles/aarts-heated-waterer-with-horizontal-nipples.67256/
no addition of humidity to coop.
Little holes? Mine go like 8" down! :gig
https://www.backyardchickens.com/threads/excavation-by-birds-a-word-of-warning.1086535/
At least a foot...18" would be better.
Good examples of anti-dig apron installation.
If rodents are prolific, burying the apron ~12" would be good...