gelatine capsules(check amazon)
SN I.V via dropper w/ 30g~ of SN dissolved in 500ml infusion bottle(you can do this with syringe). magnesium sulfate may needed to prevent dropper system disconection due seizures(it's an acessible muscle relaxant) 10g maybe enough, but i'm not sure, as it deadly itself if administered IV
some users recomend SN enemas, but i'm not sure that a human organism will tolerate SN solution long enough to absorb a lethal dose in it's rectum without diarrhea..highly concentrated solution will cause sense of burn as it do simple kitchen salt concentrated enema
drug dealer method: you stuffing huge amounts of SN in a condom and swallow it, eventually it torns inside of stomach, releasing huge amounts of substance at once. don't forget to drink a lot of water before or after you did so, it should burn painfully without