When I was much younger, back in the early 70s, I was fortunate enough to be involved in one of the scouting parties for development of Pukaskwa National Park
http://www.pc.gc.ca/pn-np/on/pukaskwa/index_e.aspWe were dropped by float plane up river about 80 miles and were to canoe our way down to a point where a small tributary flowed into the Pukaskwa river. Up that river was a small lake where we were to be picked up by float plane. Nobody had been down the river in the last 80 years so we didn't know what conditions to expect. The river turned out to be lower than expected, so low, that we were unable to make our way up the tributary to the lake. As a result, we had to spend another 4 days making our way down to the shores of Lake Superior to be picked up by boat. We ran out of food on the second last day and for the next 2 days ate nothing but malted tablets and brook trout which we could catch on almost every cast. There's nothing like fishing pristine waters.
The tablets were part of our survival kit, and they provided tons of energy and kept us going up some of the steepest portages and terrain we encountered on the entire trip. One whole day was spent portaging over ancient forest deadfall and Volkswagon sized rocks, mostly up hill. To this day, I can still remember the taste of the malt tablets and the energy burst we got after eating them. They may be old fashioned, but they work.
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