This is my go to recipe to get rid of mice in my house. Mice can't burp, so they build up gas and die.
Baking Soda as a homemade mouse poison recipe;
To get rid of mice, mix Baking soda with a filler food to entice a rat to eat it. Peanut butter is a good choice. Mix equal parts of peanut butter and baking soda together, form pea sized balls and place where mice have been seen. *Avoid this homemade mouse poison if anyone in the building has a peanut allergy.*