Hi Archangel and BST!
Do you remember something called "Fizzies" by any chance? Might be a bit before your time
In the late 50's, when I was but a waddling cabbage, they had these neat little colored tablets not unlike Alka Seltzer. You plopped one in a small glass of water and presto, sheer delight for a child
. It turned plain water into a fruit flavored carbonated drink (think liquid pop rocks). I remember grape, don't know if there were any other flavors. My mom never bought them, but my friend's mom up the street did, so once in a great while I got to have some.
It was almost as much fun just to watch the tablet magically effervesce as it was to taste its yumminess
