French press. I may be a hopeless romantic but not only is the FP my preferred brew method (and yes I have literally tried everything, I work in the coffee industry after all) it is also very versatile. I also kind of like that it forces you to slow down and wait, also a reason absinthe is my preferred liquor, I like taking my time. You can easily vary brew strength by changing grind and time and you can use it to froth milk and make whipped cream. You can also use them to separate juice from pulp when making fruit juice.
But if you just want to boil and go, then instant is where it's at. Check out a company called Swift Cup. They make instant for craft roasteries exclusively. The roaster I work for sent a few thousand pounds to them and the quality of product is perfect. When brewed correctly you cannot tell the difference between a cup or drip or the instant. You can also make an instant concentrate to emulate espresso. You can also brew instant cold if you need to scoot now, but still need some caffeine.