8. Ethylene glycol
It's in your car as antifreeze. It's cheap. It looks so damn simple. It has a moderate toxicity level, however, the sweet taste can make one easily surpass that boundary, leading the ethylene glycol to be metabolized into the more dangerous oxalic acid. Keep it away from animals and pets, as they are likely to lap up the liquid as a food source. If you do ingest a large amount of ethylene glycol, death is slow, knocking out organ systems systematically over the course of 72 hours. The treatment is administration of grain ethanol, as the ethanol competes with ethylene gly…