(I had a microwave for a couple of years. I rarely used it, and it took up precious counter space, so I passed it along to the SO. I'm not really a fan of those.)
I second Zoe Girl's recommendation of a thermos. I have a 48 oz. carafe thermos with a handle and spout that I love. Yesterday, I made a big pot of cardamom chai and had it with me here at the "Command Center," where it kept the tea flowing for some time. I might invest in an electric kettle, just for the portability. It seems like a useful item to me.