Starbucks is testing a line of "handcrafted sodas" that are blended to order by baristas using a SodaStream-type machine. Soda is a hard business to break into, but it's an attractive proposition for Starbucks, especially as the weather gets warmer, writes Venessa Wong. "[S]oda is like coffee and tea, in that it's essentially flavored water with high margins," she notes.

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