How can I better insulate my coffee mug?

Question

I have a Starbucks Coffee mug (the kind where you insert your own design) and I want to keep cold drinks cold as well as hot drinks hot. I thought I had purchased a double insulated mug. But there was condensation on the outside when I poured in a cold drink. I'm not sure if it will keep my coffee hot either. Is there anything I can do to further insulate it. In short how do I keep drink drink?

Answer 1

For hot pour boiling water into it prior to the hot drink.  For cold, keep it in the freezer.