BETHESDA, Md. — Coca-Cola's Honest Tea brand is expanding its initial launch of Honest Fizz, a line of naturally sweetened zero calorie sodas. Honest Fizz comes in four varieties: Lemon Limey, Orange Pop, Professor Fizz, and USDA Organic Root Beer — the only organic zero-calorie root beer on the market. Honest Tea is sweetened with a blend of stevia leaf extract and erythritol, a natural sugar alcohol. Low- and no calorie sodas are a fast-growing segment of the carbonated beverage market. Honest Fizz is available in 12-oz. single cans and six-packs.