Insert the end of a small funnel into the top of the bottle. Pour the glitter through the funnel into the bottle. You can fill the bottle with as much or as little glitter as desired.
Insert a small bead with a hole that goes through its center into the top of the bottle and secure it in place with hot glue. Make sure that the bead is large enough so that it fits securely in the bottle's opening. You'll want to situate the bead so that the hole does not get filled with glue or blocked by the glass lip. Allow the glue to dry.
Feed a 24-inch length of cord ribbon through the hole in the bead. Tie the ends of the cord together, making sure that each side of the cord is of equal length. To wear the necklace, simply slip it over your head.