How would you be able to store them for months without processing? They'll get rotten in a few days!
Gathering food in bulk for processing is the main reason why natural food reserves have been depleted around the planet.
berries are easy to store, they dry pretty readily, using just the sun and air circulation, in a lot of different climates. in colder climates fruit tends to store itself, I have eaten frozen apples and plums dug up from under snow drifts or where they have frozen and thawed many times and they might be a little freeze dried, chewy or even fermented but they are delicious and fully edible. rose hips are best winter-spring and , they are sweeter and the fruit is more plump. mulberries dry themselves on the ground in more arid climates and are easy to store. service berries too, they sometimes just dry on the tree and its easy to put up a few pounds.
where fruit tree and berry trees are plentiful, taking back a few pounds to store is definitely not an issue. there are hundreds of acres of abandon fruit orchards, miles of irrigation ditches lined with wild grapes and plums, blackberries and rose hips and mulberry trees around here that leave thousands of pounds of fruit, and even in my backyard alone, one fig tree produced so many figs this season that even with eating copious amounts and also storing we still did not harvest everything that was on the tree and the birds and fruit flies helped out too and the soil got whatever was left.
I never buy conventional produce. I always by produce from farmers who do not use any synthetic fertilizers or herbacides/persicides, non gmo(which really isn't an issue cause most of what vegetables/fruits I eat haven't been gm'd yet anyway) and local produce from the farmers market and if I am buying from a store I generally make sure its organic, unless its from one of those same local non chem farms.
I never wash produce, if its something I am picking from the ground I just wipe off the dirt as best possible to avoid chomping down on a piece of rock. if its from the store its usually been thoroughly cleaned a few times and I don't mind if there are germs from people handling it or just ambient germs. im in contact with quite a few people but probably not many compared to others and I just use it as a chance to build immunity