I'm glad I don't like sodas in the first place. That way, I don't have to give them up and feel deprived. I told someone once a long time ago that I gave up having one or two drinks every evening and lost 10 lbs, just like that! She said that she wished she drank so she could give it up and lose 10 lbs. lol.
Caffeine in reasonable amounts is suppose to be good for you. It makes you smarter because the more awake you are, the more you learn. That may be funny sounding but it's true. Coffee and tea both have have anti oxidants. By adding milk or cream, that neutralizes the effects of the anti-oxidants. So, some...not to excess is thought to be healthy. I don't think the same can be said about soda pop, diet or sugary. Soda water has a lot of sodium I believe. Seltzer may be better that way. Another way to spruce up water, at least I like it...is to stack the glass up with cucumbers and pour cold water on that. I often like a wedge of lemon or lime in the water, which gives it a little zing.