You can't make carbonated water that holds the bubbles without something in it like salt. So Soda water before the 'White Coats' went crazy had salt in it to hold the bubbles.
In some cases that has been switched to P.chloride and as in the case of the West Coast that product from Superstore tested fine.
But its bottled using RO so the source of the water across Canada may be different.
As in carbonated spring water, I have had some great Canadian ones. The best was Whistler water but the real deal has been eliminated from the market.. this is a conspiracy story all by itself..
In short few waters come naturally carbonated out of the ground but some waters that are really good taste crappy because they are above 200 PPM. However if you add Co2 to that they are great tasting again.
The problem is that adding even more PPM as in IMAM to an already saturated product is both difficult and leaves it open for a cross reaction to some dissolved mineral..
>>Also, does bottled soda water work for ions, like using a soda machine?
I tested my first Vervaine Co2 extraction using bottled Soda water that contained RO water and LOW sodium.. I hope that is what you meant.. With Low Sodium you MUST refrigerate the bottle before opening it since there is not enough salt to hold the bubbles otherwise.