I want to home-brew some mead because why not , plus it seems pretty easy to do.
My question is :
Can any mistake in the brewing process make the drink "poisonous" ?
If you are using honey, water and yeast. Then the answer is NO. But alcohol is a poisonous substance if not used properly. You cannot make it strong enough to "poison" you in the traditional sense. Could you poison yourself by drinking too much of it, sure it's possible. But, there are no by-products from the fermentation process that would "poison" you. Enjoy!