Personally I wouldn't use any sort of mineral water - its too difficult to achieve the right balance of minerals, sodium etc and with water being stored in a plastic (chemically not pleasant) bottle for periods of up to 12 months for all brands I would think filtered tap water is purer, fresher and less toxic. [if you want to then there is a mineral water marketed at parents for use with children - Wildalp. You can get it at places like City Super etc]
But then again I wouldn't use Follow on formula. Follow on is a marketing ploy - check the ingredients and you will see minute changes in the composition of minerals, vitamins, fats etc but a 25 to 30% mark up in price - parents are made it think that this is what they need next and so they buy it.
And as for buying Nestle products.....for children...check these out:
http://www.ibfan.org/english/codewat.../NESTLE-en.HTM or
http://www.babymilkaction.org/