Pre-brewed coffee and instant coffee are the same thing. Pre-brewed is a marketing term used to describe instant coffee the same way some car dealers use the words pre-owned or previously enjoyed when talking about used cars.
Instant coffee was invented in 1906 by George C. Washington, an Englishman living in Guatemala. The process to make instant coffee is quite simple: Brew regular coffee and evaporate the water. More specific details may be found at http://answers.google.com/answers/threadview/id/565003.html and http://coffeetea.about.com/cs/kindsofcoffee/a/instantcoffee.htm.
A health concern that arises regarding instant coffee is, if there are contaminants in the water used to make the original batch of coffee, those contaminants will be present in the instant powder mix. This is especially a concern for instant coffee products that are imported from countries where the water quality may not be the same as ours.
An excellent alternative to instant coffee is Single Serve. Single Serve is ground coffee inside what looks like an over-sized tea bag. It is real brewed coffee without the hassle of a coffee maker. Single Serve coffee is made the same way one makes tea. Drop the pouch into your favorite mug, add hot water, and let steep. Cream and sugar are, of course, optional.
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