Just curious, but is the Passion Spice an actual item in Ranma 1/2?  I've read 
up to volume 32 and have yet to see references on it yet.  

NO.  Passion Spice appeared in one of the early Ranma Fanfics and has 
been seized upon by Fanfic writers ever since.  
"Passion Spice - Big Trouble" by Christopher Gadekan, for those who are 
interested in the source.

I'll have you know that my Passion Spice story didn't have any passion
spice in it at all! ^_^

However, it is used 
universally in fanfics that it seems like it is a Ranma 1/2 item.  

Many authors don't know the series as well as they like to think and 
continue using it in the false belief that it actually existed in the 
series.  It also perpetrates the myth that Shampoo deals in drugged food a 
lot - in the series she did it *once*.  Kodachi is the one who *ALWAYS* 
puts some drug in her food.

Shampoo deals with magic, Kodachi with drugs. Both of them have it in and
out of food... Kodachi moreso in the food than Shampoo.

Kodachi's cooking episode has drugged buscuits...
Love Pills episode *could* be put in food, and Shampoo used them...
Shampoo's magic mushroom episode has the mushooms in food...
Happi's noodles of strength...
Kodachi tries to poison her brother's food when they are fighting...
Akane has her sakuramochi of fate...
Shampoo and Cologne's cold noddles of death...

Hmm... that's all the stuff I can find about food, drugged or magic, at
the moment.

Similarly, what's the 
something mirror that people always talk about?  I remember it is like you shed a tear 
on it and it takes you to somewhere.  	

Nanban Mirror.
It was used once, but was specifically destroyed at the end of the story 
by Nabiki stepping on it and breaking it into pieces.  The story is 
noticable for showing a *young* (20ish) Cologne who actually appears to 
be a nice person, and is quite attractive to boot.
Something happened to her in the few hundred years following....

That's from the anime, so it's non-canon, anyway.

Kun-chan...