If you just commit an in-game day or two towards any one of the things you mentioned, you can collect enough to last quite some time. One meadows run will often net me 100 red mushrooms, 150-200 raspberries, 30-50 neck tails, 4 queens, 50-100 feathers, 50 deer hides and leather scraps, 60-100 raw meat and possibly 50 blueberries and thistles if I dip into some Black Forest. This is enough to last multiple players quite some time for meats, jelly, arrows, honey/potions and other crafted recipes.

You just need to spend some focused time on the one task. I recommend turning the grass detail option in the settings down while doing this so mushrooms and other ground based items are easier to spot. It isn’t as pretty without it, but it makes the job more productive, at least as far as mushrooms are concerned.