What do you call an individual cup manual coffee maker?

I’m looking for a single-cup system with a small cone or cup filter basket for the ground coffee and a cup or container it sits on top of. I don’t want something you have to plug in. Just stupidly simple, pour boiling water over the coffee and let it drip through to the cup.

But searching Google, Amazon and Target all I find are percolators and electric coffee makers. I want something that works on a camping trip with nothing more than a camp fire to heat the water.

Does anyone know what to call such a thing, or where I can find one?