According to hermana Taylor, these will last 5 years, and in a desperate situation 1 bar is enough to sustain a person for 3 days. It wouldn't be fun, though, since these are tiny! Dense little guys though, and super tasty- they really taste like milk and honey bars, but not too sweet. These are very filling!
She used brown paper that she found in the paint section at the hardware store, a roll of thin-ish brown paper about 8 inches high, like what a painter would tape up to block paint from splattering on the floor. It wasn't exactly what she wanted, though. I imagine parchment paper would work- this paper was thin but crisp, and she cut it into 8 inch squares. And certainly cheaper than parchment, I would imagine.
3 cups oats
2 1/2 cups powdered milk
1 cup brown sugar (not packed)
3 Tbsp honey
2 Tbsp plain gelatin
2 Tbsp warm water
1/2 cup liquid milk, warmed
Mix all ingredients in a bowl, using your hands if necessary, gently adding one ingredient after another.
Scoop out about 2 Tbsp balls, and form into bars. Roll each in a paper square, and fold the ends in. When all the dough is formed and wrapped, place in a large pot on a steamer basket, with boiling water underneath, and tuck a plastic grocery sack over the top of them, and cover the pot with a lid. Steam for 30 minutes.
After they have steamed, remove the bars from the pot and unwrap- they are finished if they easily come off the paper. They will be quite dense.
Let cool for two days on a plate covered with a towel.
Wrap each bar in a new square of paper, and then in aluminum foil. Mark each bar with the date, and store in a cardboard box (like a shoe box.)
These will last for 5 years, and one bar can sustain a person for 3 days. (But I imagine your children will be MUCH HAPPIER if you had three bars a day for them!!)