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"I've been very obsessive about writing science fiction for far too many years. Anyone with an ounce of sense would have given up years ago."
- Charles Stross

Flavor-Capsule  
  A small pill used to turn ordinary water into a flavored beverage.  

The young general set down his cup in its flaring sheath and it refilled. He dropped the offered flavor-capsule into it with a small splash.
From Foundation and Empire, by Isaac Asimov.
Published by Doubleday in 1952
Additional resources -

The idea of using a flavored powder to turn water into different flavored beverages is an old idea. I'm not sure how long the idea of using premeasured capsules of flavor powder might be.

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