Your best bet are tea's. Look into a good green-tea, black or green/black hybrid - you also gain a bunch of anti-oxidents along with losing all the processing that goes into things like 'Vitamin waters', sports drinks etc.<p>In my area (colorado) tea's have become a very big business and we have several 'local brews' to choose from (Xing and New Leaf are my favorites).<p>Tea is a great option compared to something like a diet coke, and if you get use to no sweetener at all, it's actually one of the healthiest things you can drink. I tend to switch between a honey sweetened green/black tea and a 'naked' version without any sweetener.<p>Also most restaurants offer a brewed tea so you don't have to worry about having only soda options when you are grabbing a bite to eat.