Rye, kraut juice, and soda makes for a great highball. Easy on the kraut juice - I go with 2 jiggers of Jim Beam Rye, 1/4 jigger kraut juice, poured over ice and topped off with soda (or ginger ale if you prefer).
Of course, I just use the leftover brine from sauerkraut - I've never even seen the brine itself sold anywhere.