I don't really understand your question?
Bettas just need normal water from the tap thats been treated with declorinator (I use AquaPlus). Make sure the temperature doesn't go below 70 degrees, 75+ is better. Doesn't matter what the Ph is.
Any sort of tannin will also be beneficial. In my opinion bettas NEED acidic water to thrive, you can do this by adding something like blackwater extract or indian almond leaves- or my personal favorite Amazon Rain.