Right, there is no way to tell which tap is which! Wait, the left tap has a tiny green ring (see it?) the middle tap has a blue one, and the right tab has a white one. I will guess that Blue is cold, but which is sparkling?
So here's a quick mock of a much better design in my opinion, built in ~4 mins according to the techniques in the Book.
Natura, you can have this design for free. Just stop making $5,000 water filters that are not user friendly!
Remember, if you want to learn to make quick mocks like this, Sign Up to get the book.