EDIT 2:
I retextured the plasmid container to physical, engineering and combat tonics for fun.
-snip-
Instead of making multiple textures for it, make the container color work by the normal color setting things. You know... like... how you set vehicle color. That way, one texture and all.
Warning - while you were typing a new reply has been posted. You may wish to review your post. Edit: And, anyway, if you look at my avatar, you're not tapering the bottle tight. It's not as... bulbous as that.
Edit 2: And the face part is much more pronounced. Bigger.