The exante water flavourings have a high carb content so are abit rubbish anyway.
You could always contact your nearest cambridge diet counsellor (look on the CD website) and ask if they will sell you their flavourings.
That's where I get mine from.
Have you looked at the sticky in the main part of the exante forum? The 'what can you drink on exante' one. It has tons of things you can drink instead of just plain water in there.