#1 It would depend where you are too. Seem to remember a net that can snag freshwater fish is good; it’s not the most satisfying but it’s protein.
Read where wilderness survival experts from various backgrounds (Texas to Africa) had a tough time in the Pacific Northwest despite combining their experiences and skills (think Outside magazine which recently bought Backpacker)
They had an easier time in Texas and an even easier one deeper in the American South.  My guess is the # of smaller animals to provide food increases in warmer climes, .. maybe nutritious plants like tubers?  (not plants for “salad” but for calories, proteins, etc.).
One, who had done her PhD in African wilderness survival skills (guessing anthropology?) backed up by her own practice, said Africa still had better resources for bush survival vs the US.
Of course in Africa (IMHO) there’s more animals that are dangerous to humans too.  Remember my parents saying they had to keep their tent doors closed on safari lest campers become big kitty food (lions, etc..).
The survival experts were probably doing this to see how long they could live off the land, while a regular person may just need to hold off until rescue.
#2 would be what we bring in.  One guy whose car was stuck in a rural PNW environment survived 5 days just by keeping dry on the outside and hydrated internally (none of that survival rigmarole.. except gathering water from evergreen leaves wet with dew), but may have relied on body fat which more and more Americans have ample stores of.  It’s uncomfortable but as long as we can keep from getting hypothermic in cold/hyperthermia in hot, good water to drink, away from animal bites/stings, .. think food is a secondary concern as long as it’s not too cold.  Recall reading climbers stocking up on calories with peanut butter slathered on sausage pre-big climb.  My mondo burrito (beans, rice, cheese) pales in comparison..