Buy the EZR eye cream from MAC PRO if you want to stick/enhance/mix glitter and pigments for your eyes. (looks just like mixing medium tho, its not an actual cream like texture)
The water based mixing medium is also good, but recommended more for the face and body.
These will be far easier (and much
safer) than any other glue.
To put glitter on top of eyeshadow - use the Ginger brushes (242), dab in EZR, then on glitter and lightly pat on eye! EeeZee as that (pun intended
)