Salt, dicalcium phosphate and a feed block dig the hole break it mix it and your good to go. I buy about 50 lbs of salt very cheap, 10 lb of di-cal, and one mixed block made 4 sites. Di-cal is your biggest expense, I buy it through a local farmer because he gets it fairly cheap. The deer feed block is like $10. All of this you won't spend more then 40 or 50.