Bonavita .5 Liter Travel Kettle
So you are on the road...you have roasted coffee, a hand grinder, a filtercone, some filters but no hot water. Hotel room coffee makers and single cup coil heaters won't get water hot enough. Gas station/convenience store hot water probably comes from a scale-filled pipe. Unless you have access to a stove and a pot, you might have to settle for commercial coffee. BonaVita felt the traveller's pain and developed a water boiler that's compact, works fast, is built tough.