Angel's Trumpet is a plant, that grows mostly in South America. Some naturist places have it. They are pretty as hell. With three leaves of those, there is enough poison to pass to better life (obviously the size of body weight and height matters). I suggest in deep research to make sure one is aware of every detail. Peaceful? Don't think so because causes hallucinations. But who cares, no dismissal or goodbyes comes easy. It is my plan number three or four if I happened to fail the other methods I have prepared for myself. But talking about household, the chemical method (they mention here , search). It uses mostly cleaning products and stuff like that but they need to have specific ingredients and it is hard to make it work given that it needs a close space.