Do you know long the coffee cans are kept heated? I'm concerned that those cans have had hot coffee in them for days on end, which is generally not good for food (heat breaks down its nutrients and often produces free radical byproducts).
>>Unlike hot can drink machines in Japan, the Starbucks machine does not keep the steel cans heated. Instead, the container heats after the customer makes a selection.
Neat. I have / used to have a pair of 'hand warmers', plastic bags with a fluid of sorts and a copper (?) coin you can 'flip over', the click / shock causing the fluid to crystallise and generate heat. Those can be reused too by putting the (crystallised) bag into hot water for a bit.
