I LOVED Fizzies!
I think they had cyclamates in them which is why they were banned. They were sweet and fizzy and although they were ok as a beverage, which is what they were meant for, they were best taken “straight!” For you youngsters out there, picture fruit flavored alka-seltzer.
They tried to reformulate fizzies without the sweetener so that you had to add sugar to the water. Just not the same. I think it became clear real fast that few kids were using them as intended.