If I remember right, the normally fat soluble vitamins (A,D,E and K) are water soluble in the cf specific vitamins, and in higher doses. Here's a informational link to the vitamins I use:
<a target=_blank class=ftalternatingbarlinklarge href="https://www.sourcecfnutritionals.com/forms/Binder%20Pkg%20Insert%20Page%20-%20Softgels.pdf">Source CF adult vitamins</a>
I like the kid's chewable ones from this company too, lol.
You can order these directly from the company website. I hope that helps.