Thought I'd try this on a couple of my fics.  Some spoilers involved. 

SEQUENCE
	No change to status quo-1 drink
	Nodoka has major role, Tsubasa appears-4 drinks
	Elseworld splitting off before Fateful Trip-1 drink 
	Nodoka had something to do with Ranma's upbringing-2 drinks 
	(The part about being able to tell by his behavior is irrelevant 
since the Ranma she raised isn't actually there...)
	Total=8 drinks

RANMA 'N' ROLL
	No change to Ranma's status quo-1 drink
	Roll gains curse for good-6 drinks 
	Gosunkugi appears-1 drink
	Crossover with US cartoon-3 drinks
	One-sided relationship (Kunou to Roll)-7 drinks
	Total=18 drinks

RIDERS
	Relationship is resolved-2 drinks
	RanmaR gains curse (presumably for good)-6 drinks
	Everyone lives happily ever after-3 drinks
	Crossover with live-action series-4 drinks
	Mousse/Shampoo lemon pairing (off-screen)-1 drink
	Total=16 drinks

SKJAM!
(still a little miffed he wasn't added to the author part)