The 'ingredients' referred to in the OP read: baked wheat flour, hydrogenated soybean oil, sugars, malt, vitamins (contains no meat or animal fat)
You could replicate these in your own home for pennies. Back as a youngster (1970s/80's) I used to go backpacking & I would make what I termed 'trail bars' - you couldn't buy them then.
Little bit of butter
Honey (or syrup, less healthy)
Malt
Porridge oats
Currants (pref soaked for couple of hours in alcohol - whisky by choice!)
Melt the butter add honey add 'juice' (if any) from currants & stir in the malt then oats & currants. Spread in baking tray & bake until very slightly crisp.
Cut into slices & wrap in clingfilm. Pack in airtight container (for emergency food you could freeze & leave in freezer until problem?).
They 'seemed' to last for ages even when packed in clingfilm. I used to make them (a big batch) and they would 'last' (don't think they did me any harm

) for a year or so.