What is the best way to kill myself that takes several hours

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What is the best way to kill myself that takes several hours of unconsciousness before being highly lethal, has an antidote that I can send to the person in case they want me to have it, that can be cured without a hospital? If he refuses then I'll do it again better. Illness or something is fine but prefewabky no mental retardation since I will.be abused for life if that happens and maybe not enough to research better or do work better to obtain alcohol. I am looking at EOs that are cheap (essential oils) but they are hard to research. Someone I live with won't have much way of knowing if I am unconcious. Alcohol seemed so easy but to on quick it seems not enough time for the person to shown up if he does want to save me. Also not much alcohol.left, only half of the 1.75L container. He definitely should have the chance, it is optional to save but he needs to get my stuff. This is a serious post.