My favorite (what I drink at home) is Medaglia d'Oro Espresso Instant Coffee. If I were going to take coffee, that's what I'd bring. Actually, when backpacking, I either drink tea or go without. Your Mileage, of course, May Vary. But I prefer the above brand to Starbucks or any other.
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May your trails be crooked, winding, lonesome, dangerous, leading to the most amazing view--E. Abbey