Up to you and your goals. Pick something that forwards your own goals and be consistent with it.
I personally only count water without anything in it (not counting the occasional salt and electrolyte powder if I'm active on a hot day and sweating a lot).
Yes everything you consume has liquid in it and your body doesn't really care where water comes from as long as it gets enough.
BUT. MY personal goal is also to change and reinforce good habits in myself. Hitting all green on my fitbit dashboard is a reinforcement for these goals but if I fudge what I permit as trackable then I'm only hurting my own self. Drinking plain water discourages me from getting into the habit of needing all sorts of flavoring in everything I consume, not liking plain water is something you can train yourself into and out of. I found when I started drinking more flavored and sparkly things some years ago I started slipping and more and more of them became things with calories and I gained weight. I also try to keep my coffee intake from increasing, I like coffee and can easily turn it into a raging habit if I were to allow it, the more coffee I drink the less plain water I drink, the more plain water I drink the less coffee I drink naturally. Drinking plain water keeps me in the habit of drinking calorie-free water and it lowers appetite and maintains hydration.
BUT for someone who is still working toward that it can be good to choose healthy concessions. Say you don't yet like water or have a raging soda habit. Then maybe you count any plain water + herbal teas + water flavored with things that have under 5 calories per 12 oz or whatever it is will promote your goals.
Remember to that it is best to work on improving 1-2 areas of your health and behavior at a time. For example If you are working on increasing your fitness then just make sure you are getting enough liquid for now to support the increased workouts and then once you have a solid workout schedule going work on improving the choices for hydration...
