I'm a mum and an aunty. Both myself and my sisters were not allowed squash or anything other drinks growing up. It was only water and because we are Scottish it was from the tap (not bottled). It never occured to either of us to say that we didn't like it because it was the only thing on offer. Due to our upbringing we also don't allow our kids to have anything apart from water. Eventually of course they will get squash, fizzy drinks at party's etc in the same way that they get chocolate etc at parties but at the moment (all under 6) they do not get anything other than water. 2 of my nephews as babies refused water but my sister perservered and now they drink it.
From my experience, I have come to believe that all children like water but that they prefer the taste of other things and so they start to ask for it and they say that they don't like water. I don't know this to be fact and so I put it out into the internet. Are children born liking water and we change their minds? I'm curious.