I've been remembering them by thinking of 'noi siamo' - 'noi beviamo/abitiamo/parliamo' and 'voi siete' - 'voi bevete/abitate/parlate etc. I found it a bit difficult at first but remembering the words like that has helped quite a bit, I've only been learning for just over a week but getting there. It's just down to practice.
I think (not sure tho) it only means the physical act, as in some of the exercises it says, for example " io bevo l'acqua" (or somthing like that) meaning you're specifying what you're drinking (water). So I think you'd have to add the italian word for alcohol (which i don't know) to specify you're drinking alcohol?