You have to use a nonpolar solvent to extract cannabinoids, nothing else will work.
its not extracted though, the water is just used to freeze the trichromes (notice the "Ice") and then the buds/plant matter are aggitated causing them to fall off. Reason this method is used is because very little evaporating is needed to obtain the hash (ie just the water that gets caught in the trichrome mud, as opposed to a vat that you then have to scrape when all the liquid is gone)
why on earth would you even wonder about this
HCl is a strong acid. Unless you enjoy chemical burns I wouldn't suggest taking it or using it with your drugs.
why on earth would you even wonder about this
It's super fucking hard to do though.