Very long time lurker first time poster here. I'm hardly an expert but I'm an avid outdoors person who once lived in a wet and wild part of Canada (thought not Manitoba) for many years and I caution against thinking they couldn't survive this long in the woods in summer. I think that *if* they entered the bush once the Rav4 was set alight and *if* they did a bit of preparation, there are better than even odds they are still alive. Here's what I'd consider important, plus of course a good pack to carry it all:
Water: the most important thing they'd need is water treatment, I carry a tiny Sawyer filter, good for 1000's of litres, and attaches to most store bought soda or water bottles so you don't need a fancy bladder. Walmart Canada has a no-name "water filtration straw" for $22. Boiling water is also an option if they have a stove and were careful when the intensive search was on. Even a few drops of everyday bleach will work in place of fancy water purification tablets
Shelter: I have no idea if they'd be on the move or not, at least after the first few days. If they kept moving a tarp would be the minimum but a tent with a mesh inner to deal with bugs would be better. If they've set up camp and are biding their time, assuming they have any of: a good machete, an axe, a saw, they could build a bushcraft shelter from natural materials.
Warmth: sleeping bags for night, good lightweight layers like merino wool pullovers or down jackets for sitting around. If not then fire is essential, which would have been impossible at night when the search was as its peak but they could get away with now if kept hot and small so the smoke doesn't rise above the tree line. There are numerous ignition sources, a small Bic lighter mini will last for weeks, a fire steel (like a flint) will last for thousands of strikes and work when wet. I don't think the matches on the ground at the Rav4 are any concern at all, they are often bought in multipacks, so dropping one box is not going to make too much difference
Food: I plan and prepare and dehydrate my meals so my food weight is roughly 800g per day. I could easily carry 10 days of food in summer when I'm not carrying extra clothing and have a lightweight sleeping bag and tent. Assuming they didn't plan and dehydrate meals and are living off mac'n'cheese, jerkey and ketchup chips then they'd probably have run out a few days ago. The easiest food source where they are is fish if they had just a basic rod and tackle kit. If they don't they'll still take at least another week to starve to death, longer if they're finding berries and the occasional small game.
And while injury or animal attack are certainly possible, they are not so extremely likely that I'd write these two off. I have no experience with the level of bugs that are reported, if they had allergies it could be fatal, but otherwise just I'd think just extremely annoying and irritating but survivable.