There's a truth (according to much reading that I did years ago when searching for a coffee maker) that while the bean and it's grind is important, the single most important criteria is the water temperature. Apparently, the best coffee is made when the water is just shy of boiling. Too hot and the coffee is bitter, too cool and the flavour is missing.
I sometimes make a single cup, and I usually do as mentioned in the post above ..... boil the water, shut off the boiling and before the water gets cold, pour it over the correct amount of coffee in a cone to produce the flavour you want. It works, but it's not as good as brewing more coffee in any machine.
In a pinch I have put the ground coffee in a cup, poured the HOT water in and let it stand before straining it thru' a filter to drink. In this way (as long as the water is HOT) the flavour is determined by the coffee, the grind and the amount of time it takes for the water to soak thru' the grind. This always tastes better than a single cup drip, but it takes a bit more work.
All above works, but the price difference between one cup made special, and three mugs dripped thru' my MoccaMaster is so little (pennies) that I usually make it in the machine.