Should this be illegal or not..?

It would be dumb to make doing this illegal, on that I agree.

As for trying it, well, not really my thing.
Flavors Instant Crystals Coffee — Folgers

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They make these crystals that are like instant coffee. One time I didn't know what they were, so I assumed they were ground coffee and brewed (what I thought was) enough for one or two cups in a filtered coffee maker. Every ounce went through and made a thick coffee syrup. I was extremely tired having just driven a long way, but I needed to be awake for a speech. It was strange tasting, but being in such a hurry I drank it down. For the next five hours I felt really good.