It has to be a dead charging system.... usually a short internal in the alternator
Your car lost power while you were driving and it will not start now because the battery is depleted.
Not likely.
The alternator is probably at fault. Charge the battery and drive the car to your local auto parts store, they will test the charging system for you for zip.
Drinking while driving
The car will stop if the battery cable comes loose.
Eventually, yes, it will.
Your alternator is not keeping the battery charged.
A lot of possible causes, I recommend a careful investigation.
Your alternator is probably not keeping the battery charged while the car is running. You need a new alternator!!
Yes
I'm not so sure :(
Bad alternator or corroded or loose cables.