Smirnoff Ice

Question

I am trying to ascertain whether or not the alcoholic beverage "Smirnoff Ice" is kosher or not. It's listed ingredients are: "Carbonated water, Smirnoff Vodka, Sugar, Natural and artificial flavours, Salt, Citric acid, Malic acid, Tartaric acid, Sodium citrate, Sodium benzoate, may contain potassium sorbate" Although there is no hechsher on the bottle I am hard pressed to come up with a reason why it might be a problem. Thank you. B'Shlaom Dazza