RE: Winter food sources
It has been my experience that mature buck will usually not travel very far to their primart food source in late season. Many does and young bucks my be hitting the fields, but the mature bucks may stick back in the timber and feed on browse close to their bedding area. I would look for acorns and locust pods - anything that is "close to home" for the deer.
Right now i am hunting over a food plot because i have seen several good bucks using it. I am yet to score on one so i plan on gettin a little more agressive as the season winds down here in MO.
Good luck!