I just came back from the grocery store with a bottle of Pellegrino sparkling spring water. I knew it said "sparkling", but I shook the bottle at the store and saw no bubbling so I took a chance. Got it home and popped the cap and instant fizz!! crap!!! It says very low sodium on the label, but ingredients says 10mg of sodium, which works out to about 20mg for my batch of dough, because of this, Im going to omit the salt altogether and see what happens. I sat and stirred the crap out of the water to get all the carbonation out of it, and have it autolysing as I type this. This is probably going to be a bust Im sure, but I'll give it a whirl and see what happens. Guess I should have just bought a bottle of plain spring water.