last trip, i bought 4 big spuds in atikokan and some onions and just roasted in foil in campfire night before and sliced and fried later on.
if you spread a #5 bag out between a few packs it wouldn't be that much effort for the quality of taste?
but, since this is  about dried hashbrowns, i got out my food dehydrator and made my own using the Simply Potatoes brand of frozen hashbrowns.
i thawed in bag in refrigerator and then spread on fruit rollup trays in dehydrator.
there "treated" so they don't turn color and i rehydrated them like Snow Dog recommended.
having eaten "boxed" hashbrowns, i think these tasted much better IMO.
worth a try if you have dehydrator??