Brewing coffee while on the road????

Does anyone have any sort of rig they have set up in their car to boil water and brew coffee while on the road?  Not actually while driving but on the side of the road maybe.  I've got some ideas but they either involve expensive power inverters or waaaaay slow water kettles.  I just don't want to drop three bills on an inverter or wait 30 minutes to boil water.  Any ideas are appreciated.  Thanks!

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