When hiking hither and yon across the countryside and your pack is loaded with all the high-tech gear you've read about in previous reviews, there might come a point where you begin to feel an emptiness inside your stomach and your thoughts turn toward food. That is what I'm going to talk about today: portable nourishment. Many hikers favor canned foods, breads, cheeses, etc. These are perfectly adequate low tech solutions for those who don't mind products that are a bit bulkier, heavier, or require more preparation than their space-age cousins. If you're on a longer trip and need things that will last, but won't weigh you down quite so much, you can turn to the wonders of modern science. In recent years, many modern marvels of food science have been created, packaged, and made available for your convenient joyous consumption. To examine the best of the low-weight, low-prep options,…