Is there a way to make a cup of hot chocolate from scratch without boiling water?

I need to a demonstration speech for cl, and I have decided to do a demo on how to make a cup of hot chocolate from scratch in cl today. Is there a way to do so? So my speech can last 6-8 minutes. I cannot have a boiler in the room, but what i can have is a container with hot water. Instant hot cocoa won't last me 6-8 minutes for the speech. I want to make a cup of hot cocoa without using boiling water.