... little glass vial.
A LITTLE GLASS VIAL?
Or sometimes this bug's ass, or so it would seem. I don't think they ever explain wtf is up with the little glowing bugs in the beginning of Repo, but I like to imagine that they suck the zydrate from corpses to use as a self defense mechanism from their glow-worm-scorpion-like tail to paralyze it's enemies.
Doodled with minimal references so most of it is my own invention for my DA Journal layout. Here's a big version for your amusement!