Price of bottled water in supermarkets

is deep river rock spring water or mineral water? (what's the difference?) or is it like dasani, also bottled by coca-cola just tap water? their bottles are from what i can remember startlingly non-commital on this point?
AFAIK it's tap water, probably run through some filtration process and maybe a dash of salts added or something. I think that they only claim it's 'Pure' water, whatever that is.
 
Good point. Might be worth checking the [broken link removed] when attempting to distinguish between "pure" and "spring" etc.
 
I thought they used to have them near the departure gates in Dublin? SF International Airport definitely has them. I think Chicago O'Hare does too. Can't remember if Heathrow has.

I do recall seeing a drinking fountain in Heathrow at arrivals - not much use. I haven't seen any in departures, though didn't look that hard

I can't find any in Dublin airport, and have been keeping my eye out for them. I vaguely recollect seeing one years ago, but think it may have been removed. Which departure gates are you referring to? A, B or C?
 
Not sure which gates but whatever one(s?) is (are?) used for US flights - Chicago and SF.