From Mum, in Kelseyville, California:
Thanks for the story and the hint. That's still an economical and healthy oatmeal 'trail mix' to take along on hikes and trips. Small cartons of milk are available now that don't have to be refrigerated until opened, and would be easy to carry. Some commercial granolas and trail mixes are so loaded with saturated fat and salt that any benefit from the exercise would be canceled out by the munchies.
Another suggestion from Mum:
I'm with you on that one. In my opinion, children are as likely to be allergic to milk and baby wheat cereal as to other foods, and an experienced mother can soon tell if their digestion isn't up to some food. I fed my children very little commercial "baby food"; they ate largely what we ate from just a few weeks of age; finely pureed potatoes, carrots, squash, yams or other soft veggies, mixed with a little milk, bottled applesauce, scraped raw apples and bananas.... My son was insatiable. If I brought him to the table from six weeks of age on, he grabbed at my plate. One of his favorite treats, while we ate, was to suck on the end of a pork chop or ham bone. My kids ate virtually everything when they were older (still do) with great gusto.
I agree, since one can't control the junk kids want to eat, that at least we can mostly make them buy it with their allowance. Thirteen is a difficult age, isn't it? Kids want to do the contrary to what we want them to do, including inventing their own diets. Part of the "growing away" process. But the apple doesn't fall far from the tree; most kids raised with good eating habits come back to them eventually.
Thanks so much for your valuable input.