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If SHTF vermin will be a big problem, rats are huge and can reproduce very quickly. With out modern pest control we would be over run with them. That being said, you can buy rat poisons from any hardware store or even Walmart.
They contain harsh chemicals that can be deadly to humans and pets around the home. Over at wikihow.com they show you 3 ways to make safer poison and even save you a buck or 2. See the original article below: