Does this mean every second definition of a word in the dictionary is also a homonym? How different does it need to be?

"homonym" == "same-name", so, yes by definition. it has the same name as another definition.

You're an alcoholic because your blood is alcoholic.

This is false, that's not what the noun 'alcoholic' means.

You would think that a state with such a high rate of heavy drinking coupled with pretty lenient DUI penalties would be a very dangerous place to drive, and yet Wisconsin ranks 34th (out of 50) for drunk driving deaths per capita.

Wow, look at the contrast between Nevada and its neighboring states Utah & Idaho. Imagine being an alcoholic in Nevada then crossing the border to a soda pop state. "I'm cured!" 🤣

West Virginia surprised me, Wisconsin didn't

Sure before modern civilized times when the water supply was filthy with human waste, that's why everyone had to drink alcohol. Because they polluted their own water supply with shit. Glad science figured things out and got us back to drinking water again.

The idea that people drank beer because it was safer than water is a myth. They drank for the exact same reason we do today…you get a buzz. A side benefit was that beer had calories in a drinkable form. The safety of the drink, as in not full of harmful microbes, was an indirect but not primary benefit.