I wouldn't worry about the deer smelling whatever drink you have, cause as TC already pointed out, if they are smelling your drink, they're already smelling you. I rarely drink or eat anything on stand. Drinking makes me have to pee, and that requires a good deal of movement, so i don't drink much. This year, i'm after a hoss, so i'll probably spend longer sits and i'll probably eat lunch and drink a little water. Coffee also can act like a laxitive, so think about that.