I ran across a new brand the other day; SteaZ 'green tea soda' comes in a root beer flavor:
http://www.healthybeverage.com/

The flavor going down was acceptable, perhaps more fruity than rooty. The aftertaste reminds you about the 'green tea soda' bit. Don't say I didn't warn you. There is also visible particulate suspended in the liquid - tea leaves?

Quote:

INGREDIENTS: Sparkling filtered water, organic evaporated cane juice, natural root beer flavor, caramel color, organic Ceylon green tea, citric acid, ascorbic acid (Vitamin C) and sodium citrate. The Healthy Beverage Company 2865 S. Eagle Road Newtown, PA 18940 800-295-1388 215 321-8330 office // 215-321-8335 fax info@healthybeverage.com

_________________
"It is better to have drunk and tossed
than never to have drunk at all."