Sort of. Not full-on survival mode - but close.
What happened was this:
My father is an avid outdoorsman, has been all his life (in fact, he literally grew up in a log cabin built by my grandfather in the Canadian north - my grandfather was a forest entomologist who lived for large periods of time in the woods).
When I was a kid, I used to go on lengthy canoe trips all the time with my dad, sometimes with others, sometimes just us two (as I got older and able to pull my weight).
My dad moved from charting round-trips, to a “fly in, canoe out” model - where he would hire a floatplane to fly us, our gear, and the canoe into a remote lake in Northern Quebec, and we would then canoe back to the road. He would plan these trips using topographic maps. Some of these places were very remote (indeed that was the point), and impossible to get to any other way - they were hard wilderness, that maybe somebody came through every couple of years, if that; some places probably didn’t see a person every decade.
Well, one time we flew in, with all our gear … and only when the plane had left did we realize my dad had forgotten one of the packs. It was the pack that contained most of our food! This wasn’t good.
However, we did have all our fishing gear. Fish in those remote lakes were reliably plentiful. So we were not going to starve - at least, not quickly; you can’t starve to death on a three week trip eating mostly fish, but you can get damned tired of fish.
I remember one day helping my dad to scrape out the last of the peanut butter with a playing card, about halfway: that’s when it sunk in that we had, literally, nothing left that we had brought with us.
The bad part was that the route he had planned turned out to be a lot more difficult than expected. Some of the rivers he had picked out on the topo map were not really navigable. Pushing the canoe through a swamp, up to my knees in mud and leeches, and surrounded by a nimbus of mosquitoes - with nothing to look forward to eat but more fish - the romance of the wilderness had somewhat lessened.
There was probably other food to be gotten, we had the occasional handfuls of rasberries, but not if you wanted to keep travelling. Gathering takes time.