I dunno about this one
USATODAY.com - Single-serving coffee can heats itself
Beginning Jan. 2, consumers can buy a 10-ounce container of Wolfgang Puck gourmet latte at the store and heat it by pressing a button. No electricity. No batteries. No appliances.
"It will expand the way people drink coffee," says Puck, the celebrity chef with a growing empire.
How does the can do it? A single step mixes calcium oxide (quicklime) and water. It heats the coffee to 145 degrees in six minutes — and stays hot for 30 minutes.
It sounds like a technology used by soldiers to heat Meals-Ready-To-Eat. But MREs mix magnesium iron oxide and water and need several steps. This is one-step and self-contained.