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Hospital Food Sucks!

Anyone know of a worthwhile portable heated meal container that plugs in to USB?

As some of you know, my husband suffered 3 fractured ribs and a collapsed lung after a bad fall and is in the ICU recovering from surgeries.

I would like to make some hot meals at home and keep them hot in a portable heated meal container by plugging in to USB ports during the drive and walk to his room - about 90 minutes.