We are at -3 actual, wind chill -14 atm.
One trick we did yrs ago when it was so cold we could not pour water for the rabbits (it literally froze b/f they could get a drink, discovered w/ a couple having their face freeze into the dish as we poured, very not good) anyway to get them _some_ hydration we cut apples which they could chew & eat frozen, which gave them something other than dry feed in their system.
I put apple peeling into each bird pen last night. I hope to get them some liquid water today, but it freezes so fast they will barely get a sip b/f they are pecking ice, so turnip greens and cut apples will also go into each pen along w/ dry feed as a way to keep them hydrated and feed.