I have just bought one at Coles called Natvia, says 100% all natural and one teaspoon is 0.6 calories (sugar is 16 calories).  Had a fingertip taste and it was very sweet, did not seem to have a bitter after taste.  Ingredients: Erythritol and Stevia (Reb A) .  Both of these are in David's book as "your call".  Had a quick look on the natvia web site and it seems like you can cook with it.  I was originally looking for Erythritol (on it's own) and could not find it, but found this one and looking forward to using it.  I believe there is no Fructose in either of them.  It is in a powder form.