Couple of big loafs of sandwich bread, just tear it apart with your hands into a BIG bowl. Chop up some onion and celery, and cook them in some butter (year, it takes alot of it) until nice and tender. also warm up some chicken broth.
To your bread, sprinkle a couple of tablespoons of that poultry seasoning that comes in a box. Pour the butter and vegetables in, and a little bi of the broth, and start mixing it together with your hands. How much you knead the stuff together determines the density - only lightly mix it if you want fluffy, pasty stuffing, knead it a lot if you want dense filling stuffing (my preference). Add more broth as needed to make a good consistency, taste to adjust for seasoning, salt and pepper.

when you cook it, put a little of the broth in the bottom of the pan to create steam and keep it moist.