Already sent a PM, but for anyone else interested I got the best results using milk grains with coconut water & just treating it as it was milk kefir.
I do the same with raw goats milk & comes out very nice. I actually prefer the consistency to cows milk kefir. It works really well with a teaspoon of maca powder & cinnamon, plus a little stevia.
For the coconut water kefir I would always add a bit of stevia at the end to give it the sweet taste back, its not quite as good as in its original form but you get used to it.
On a separate note I was horrified at the taste of chicory coffee/drink when I first tasted it, especially as I love coffee, but its something you get used too over time & in fact it works fantastically when when making coconut cup cakes, and the like.