As tiraq said, the voyaguers were basically human outboards. They paddled and portaged. They lived on baked beans, pea soup, corn mush and salt pork.
They didn't have time to hunt. The trading posts purchased buffalo meat and pemmican from the Indians and I assume the voyageurs were fed some of that on the return voyage.
From McGill University:
It was expected that each voyageur work at least 14 hours a day, paddle 50 strokes a minute and be able to carry two "pièces" of 90 pounds across each portage. Voyageurs suffered from drowning, hernias and broken limbs, twisted spines, rheumatism as well as clouds of black flies and mosquitoes against which the best repellent was a mix of bear grease and skunk urine. The voyageur's daily routine was a back-breaking one: for the 6 to 8 weeks he was on the road, he was roused as early as 3 am, and set off without eating breakfast. Before 8 o'clock, a breakfast stop was made on a beach. At around 2 in the afternoon, a midday lunch was served on the boat, though often lunch was only an opportunity to chew a piece of pemmican or "biscuit" while rowing. A stop was made for a few minutes each hour to allow the men to have a pipe. This event was so important that distances came to be measured in pipes: 3 pipes might equal 15 to 20 miles of travel. A 32 km lake would be measured as 4 pipes or 4 hours of travel, depending on wind and waves. At nightfall, the canoes were unloaded and turned over to serve as shelters. Supper, which was pre-cooked the night before, was warmed and served. The men dropped down on turf, moss or beach with their heads under the overturned canoes. A tarp provided protection from wind and rain. During the night, a kettle filled with 9 quarts of peas and water was hung over the fire, added to it were strips of pork. This simmered until daylight, when the cook added four "biscuits" and continued to let it simmer. At dawn, the call "lève lève nos gens", resounded through the camp. Canoes were loaded and launched. The swelling of the peas and biscuit had now filled the kettle to the brim, so thick that a stick would stand upright in it. Three pipes, or about 12 miles of paddling were done before breakfast.