Hi!

I was just searching the Internet for "Tangawizi", when I first came to this site and then found another you might want to check out:

http://swahilicoast.com/swahili_recipes4.htm

It tells you how to "brew" your own Tangawizi - I didn't try it yet, but I definitely will...

As I think "Stoney" has a touch of "Sprite", another thing worth trying would be to add ginger extract to "Sprite".

I hope I could be of any help,

Martin, Germany