Hot Coffee, In a Can

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Starbucks sells instant coffee packets that you can use to make a cup of coffee, assuming you have hot water handy. What I propose if that combine the technology they use in those instantly-hot soup cans to heat water, which, through pressure, flows over coffee grounds making instant coffee. I was going to post a picture, but it's not necessary. The concept is simple. I'm surprised they don't have these already.