Actually, I would just keep drinking tea.
My children adore tea, but I've been drinking it for long before they were born, they see me drinking it, naturally they want some, and they come and steal it
Of course, I'm a mean cruel evil mother who only allows milk, juice, water, and tea (well, and soda with pizza once a week) so they don't know the whole fruit drink/soda thing all that well (and, to be fair, I don't drink them.)
But I wouldn't push it. Just let them come around to you while offering healthful alternatives.
(Edited because typing is still not my friend!)