If you will keep feed and water outside in the run, then build a shelter for it.
Since you have so many kinds housed together, I would build TWO shelters in the run to make sure no one is getting bullied off the feed and water.
You need a shelter to block wind and snow, or they will not eat and drink enough.
Even with a shelter for the feed and water. . .. if there isn't enough of a wind break in the run, at -20F the chickens might chose to starve over going out to eat and drink. So... watch them. Check their keel bones on occasion to see if they are staying in condition.
The geese and ducks will be fine.
However, at -20F, actually, starting at 10F, I HIGHLY recommend removing all bathing water. Yes, keep a deep enough water bucket for the waterfowl to dip their heads. However, if they can bathe they will splash the water all over, and coat everything in ice. And that is the best case. Worst case they will freeze their feet to the ice so they can't move, and they can even splash water over their back, that instantly freezes, encasing themselves in ice.
So.... feed "all flock" or whatever local equivalent you have.
And be very careful with what waterers you use.
At -20F most waterers will get some ice, even with a heater. The poultry get good at learning to break through the ice, and geese are pretty strong so will help.
I like using a water de-icer that is safe to run dry, and safe to sit on plastic/rubber.