we live in the country so we're not using city water but our own well. I tried switching my now 3 week old to powder formula (he was on premixed before) and he was just miserable. Bad gas etc. My husband mentioned something about our water giving him a hard time. I don't know whom to ask, since my GP is an idiot and I have to find another doctor for LO. I also couldn't find anything on the internet, so if anybody knows anything and would like to share it with me that would be greatly appreciated. I'll try it again when he's a bit older and if he still has problems I might have to buy the nursery water at the store.