Sam was offered water only from babyhood (as well as his soya which may well have given him a taste for sweet things but he wiouldn't bf and was allergic to formuls). he didn't drink it, only would drink soya, his teeth when they came rotted and somer were removed. DH drinks water until it comes out his ears, i confess to not liking it but I don't drink juice either- if it's a meal, I serve water to everyone. Everyone drinks it bar ds1.
When he got ill with dehydration in the summer, it was one of the hottest days of the year and he had been made to run a fun run at school. We don't offer squash, ever, at home.. we don't buy it. It's muck. We called NHS direct and tey were getting an ambulance out to us when dh said sod this, popped over Spar and bought Ribena. Down it went, ambulance was cancelled.
Like Hell am I going through that again for the sake of water!
DS2 loves water BTW, and often chooses it. DS3 we are battling with but we are sticking by our guns.
Should the no juice rule come in at our school, then DS1 will have to come home for lunch, which will have a horrible knock on effect. They havea no exceptions policy: If the school rules say it, you all do it, regardless.