I'm not an HSI member...but have received their e-letters for several years. I am not familiar with the product you are asking about...but you might try posting on their forums. Even though their site says you need to have membership to be part of their community...it appears that all you need to do is register to actually post on the forums. Here's the link...
Give the registration a try...I believe it is free...it was several years ago...and see if someone can help you in locating these fizzy pills.
And if you find them...let us all know about this bubbly wonder drink! :)
And so anyone reading this knows...I found the HSI site to be informative...although much more conservative than CureZone. At least...that was the case several years ago.