nickman is absolutely correct. I have hunted and seen bucks in the snowberry bushes, seen them eating lichens off of rocks and trees, in alfalfa fields, beet fields, and willow flats. Just depends on the time of year, location and external pressures. Water sources aren't always a sure thing either as bucks can sometimes find enough moisture in the green feed they eat and aren't tied to water as frequently. They will also eat snow if they need too. Scout the areas that you find interesting and then focus on what you see deer eating. Be prepared as this will change with the seasons and forage availability. Good luck.