Hello,
I learnt from my business course, in the marketing course that diet coke and coke zero are exactly the same, they went for the "coke zero" name since they noticed that the "diet coke" was not attracting the male population since men usually don't like the term "diet".
I would say if you can please stay away of all kind of sodas, no matter what they are, stick to plain water or use a little bit of Mio.
As for walden farms, use just a little bit of them, after all they are not that great tasting to fancy having a lot of them