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Because of the flavor extraction of whichever coffee you choose to throw in it, I'd probably stick with the french press even if simplicity, compactness, and price were irrelevant. Perfectly pulled espresso could sway me.... maybe. On the boat though... french press... no hesitation.

Though the mention of instant is typically followed by cries of heresy in coffee circles, I'd recommend Medaglia D'Oro instant espresso. That's what I pack when even a french press is too much. It also doubles as a great way to infuse just about anything with intense coffee flavor.