all kinds of things the most common for local dealers is nosotol (not sure of spelling) a vitamin supplement for hair growth found in most health food stores, when mixed it kind of attaches to the coke rocks so it dosen"t look like a bag full of powder it can easily be recompressed (re rocked)
Answer 2 another item that is most commonly used to cut Cocaine would be baking soda. Baking soda is somthing that can commonly be bought easly from your local food store. Dealers will some times use this to hold some moisture in humid places as not to disturbe the propertys of the cocaine. razor blades.