Soda actually DOESN'T typically contain sodium. Read your labels; it generally only has what's naturally in the water. Most people's well water contains more. Diet colas (and regular colas) do contain acids that are bad for the enamel on your teeth, but fruit-flavored drinks don't have that effect. Diet drinks don't have any apparent benefits, but they're not particularly bad for your body, just your budget.
Coffee and tea both have antioxidants, and coffee has been associated with a LOWER risk of liver cancer, Parkinson's, and maybe Alzheimer's. The association isn't strong enough to recommend that people start drinking it if they don't already, but it certainly takes coffee out of the "bad for you" category. Tea is actually a healthy food, too, especially for people who don't get enough antioxidants from fruit and veggies.
Where I live, I'd have to say water is the worst! I'm in an area with horribly hard water, and rates of kidney stones are really high. (Although I'm not 100% sure that it's because of the water itself; it could be that people just don't drink enough because it tastes bad.)
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