I've been lazy and using either premade syrups or just juice and carbonated water. Considering though...
You're probably looking at the zest or artificial chemical flavoring then. I don't think you would want to use the actual juice at all, unless it was filtered and cleared. Of course sugar and acids, (ascorbic and citric) and food coloring.
Secondary: GF Czech Lager
Waiting to be kegged, Italian Primitivo
Kegged&Ready: GF Orange&Coriander, GF Honey Lager, GF chocolate ale, GF English ale, Island mist (zinfandel), Island mist (cbry malbec).
Bottled: Infected Mead, Dry Hard ciders, Accidental Sorghumwine, various unnamed.