I only give my kids tap water, and then very occassionally they have a juice. I do think though that alot of the decay is caused by parents thinking they're doing the right thing by giving bottled water, not realising there's no flouride. Guess it's important for adults too, to drink tap water.
Milk is fine for children too, just not in the cot!!
I am suprised that common sense does not prevail in these situations. xoxo