The birds that stay around for the winter need food, water and a heat supply. Seeing the abundance of snow in these parts it's safe to guess that they won't go thirsty for a while.
As for food - they don't need as much food as in the warmer seasons seeing they don't burn-up their energy as fast (they don't fly and move around and as fast as in the winter). We are always putting something outside for our fine feather friends, dried toast from breakfast, out dated bread, crackers and those birdseed cakes you buy at the store. This morning all containers were empty so I made some from what I had. The main ingredient for their energy in these is peanut butter and that is mostly what keeps all those birdseeds glued together.
I've just came back from setting them outside; our little friends will be happy come tomorrow morning.
Have a great start of the week !