From OP:

I’m surprised they haven’t started charging people to use the restroom.

So you aren’t my sister, but you can still fall into category B.

See: category B

The only two people I know who prefer vodka are my mom, who drinks a glass of cranberry juice with a splash of vodka (category A) and my sister who strictly drinks vodka w/water and lime (category B), so I agree with your assessment.