The other day, while watching a sad movie, I thought of something that has enabled me to moisturize my eyes without eye drops. I just make my eyes tear. At first I would try to think of sad things to make me cry, but that is kinda hard to do. Then a far more practical option presented itself. Whenever I yawn my eyes tear up a little bit. Much easier to make myself yawn, than to just cry. Just visualize someone yawning - since yawning is contagious. Odds are you have already yawned since reading all this text about yawning, or you are repressing a yawn. Let it out!
It's not perfect, but it's better than nothing, esp if you're in a dry eye bind without your eyedrops handy.
While you're here, read my other post BOO! Ghosts scare me :,<(