Maybe that one particular container of yogurt you purchased was from a bad batch or it had spoiled. I would give it another try and try different brand --as far as adding a fruit taste to it- I generally use something like Polaner All Fruit(-the jelly that is only sweetened with fruit juice) , they have lots of different flovors, or sometimes I just use honey and a mashed up banana.
I don't want to discourage you but it is gawd awful.It is VERY bitter! I initially thought that I had picked up the wrong container. I had to read, read AND re-read it over and over again to make sure that it was in fact Greek Non-Fat Yogurt. And it was.
I would rather eat my chicken's lay pellets then to eat that stuff. YUCK !!!!!!!!!!!!
My taste buds must be different because so many people give it rave reviews, which is why I decided to try it. I'm so glad that I only wasted $1.00 on this crap. My customer review for this is that I am VERY disappointed. I will never buy this again nor will I recommend this to anyone.