Use 24v Batteries to run 12v System... Possible?

Yes, Mr Wiz, this is exactly what I used to do with that little pot in the photo. With sugar mixed in before filling it with water, to give it time to dissolve. Only don't add cold water after, prefer with a few grounds but hotter. Those few that get into the cup, settle to the bottom. Arabs say that coffee should be hot as a woman's kiss and sweet as a honey.