Soy Sauce Substitute ???

The last diet that the wife and I were on called for us to replace our use of soy sauce with tumari sauce. It is found in the same section of the market as the soy sauce. I haven't read the bottle but it was our recommended "substitute."

Braggs liquid aminos

http://www.formerfatguyblog.com/2007/09/29/what-is-braggs-liquid-aminos.html

I am not aware of a Soy Sauce substitute.

I dont know what you are using it for but I have used a Worcestershire in place of SS (I was out)for a meat marinade and another time in a stir fry.
It tasted good -different flavour- with less sodium that I prefer. I use a store brand, it contains no soy.

Hope this helps...