If your counsellor says no then I would steer clear hun... or.. if you want to risk it try it for a day or 2 and see if it affects your ketosis... also check the carb levels... the thing with Perfectly Clear Strawb & Kiwi is that it is carb free too and no citric acid, it does have malic acid in it.
If it helps.. here's what it says on the label for ingredients..
Carbonated Water, Malic Acid, Sweetner (Aspartame), Flavourings (including natural fruit extracts), PReservative (Sodium Benzoate).
Contains a source of Phenylalanine.
Values pre 100ml (3.5fl oz)
Energy 4kJ/0.9cal
Protein Trace
Carbohydrate Nil
Fat Nil
I know, it's sad that I have a bottle to hand - lol - what can I tell you! I love the stuff and it's helped keep me on track big style!
Best wishes and hope you find out for sure soon. (let us all know as it's bound to be cheaper too!!)