I did recently try coconut water. Yuk! My sister handed me some and said, "It kinda tastes like spinach." So, of course, it tasted like spinach to me and, needless to say, was not to my liking. It's supposed to be very good for you, though, so way to go.

As for the diet pepsi, I only started drinking it about two years ago. Like you, I have always been a big water drinker. Somehow, I ended up drinking soda occasionally, then every day . . . then 2 cans a day, then 3. I started to get headaches until I would drink some. And I read that it was the aspartame, not the caffeine that I was addicted to.
I have not bought soda at the grocery store for 2 weeks! I get a 32oz. sometimes when I'm out, and actually have been getting the regular kind (not diet) with all the real sugar (apologies to my waistline). But this is only once or twice a week, compared to 2-3 cans a day. Hopefully, the habit can be gone for good; but I fear that I may never be completely cured. Like alcoholics that relapse and struggle their whole lives. I should have never started.

I have quit and started again several times this past year.