As a kid, my grandma wanted me to drink less soda (I spent the summers with the grandparents). So she switched me to iced tea, but had me add as much sugar as I wanted. As time went on, she had me add less and less sugar until I no longer needed to add sugar.

Today it's almost exclusively what I drink. The only times I don't is when I know the restaurant I'm in can't make drinkable iced tea to save their life (for some odd reason, it mostly seems to be Cuban or South American restaurants [1]) and I'll switch to soda.

[1] I live in South Florida. I suspect the reason is that Cuban/South American restaurants use coffee brewers to make tea, and I can't stand the taste of coffee.