The best way by far for me is grounded plunger coffee in an insulated cup made by "smartcafe" which has an its own plunger handle that slides inside and stays in whilst drinking, the cup is also designed for tea leaves also if your a tea snob.
These cups to my opinion are the "best" invention of mankind yet also simple and very versitile.
I can send a photo and were to buy one if your keen.
My cup is about 3 years old and gets Hammered every day ;-)
Coffee is not an addiction it's a "lifestyle"
Cheers
Sam