I've made a couple of alcohol stoves and they work much better than I've ever seen sterno muster. They also cost nothing, are tiny and weigh almost zero too.

Put a pint of alcohol with your first aid items and let it serve two purposes.

It's silly but people won't think twice about alcohol in a first aid cabinet but put it in a box with a small stove and a bic lighter and someone will think you want to burn the place down.
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"There is not a man of us who does not at times need a helping hand to be stretched out to him, and then shame upon him who will not stretch out the helping hand to his brother." -Theodore Roosevelt