Okay, I might be exaggerating, but then again, maybe not. It is true that the naturally carbonated spring water in Soda Springs, ID took first prize in the World Fair in Chicago in 1893, and again in Paris in 1905. If you go to Hooper Spring Park in Soda Springs, you can taste it yourself, for free. I did just that, and it's just as good or better than that you can buy, and infinitely more rewarding since I rode 100 miles, and hiked almost 2 miles one way to have the pleasure of dipping my cup in a happily bubbling pool of cool clear fizzy water. You can see and hear it bubble yourself below. Just screen out the chatter of the other tourists:
Here's "the world's largest captive geyser" (???) at Geyser Park in Soda Springs. I guess it's considered "captive" because it's controlled by a timer now, which is set to allow the geyser to spout once an hour on the hour. I arrived just at spouting time, and had to hastily abandon my lunch sack in the middle of the parking lot to rush over and take pictures.
I brought some water home with me. The bottle is in the fridge and when I open it, it gives a very satisfying "psssht"!