About two years ago my glider Nips became dehydrated.  It happened one night when my son who was just starting to pull up on things trying to learn how to walk had pulled the water bottle off of Nips and Buster's cage.  I neglected to notice when I went to bed that night that the water bottle was missing.  The next morning when I got up, Buster was acting fine but Nips was scurrying around the cage as if she didn't know where she was at.  It was then that I noticed the water bottle
was missing.  I felt so horrible.  My husband was at work and since we only had one car, I didn't have a way to get her to the vet right away.  I would have to wait 4 hours until my husband got home.  I called the vet and he informed me that she was probably going through a temporary blindness due to the dehydration.  I took her with me all day long and offered her nekton lori (similar to gliderade) through a small syringe.  I allowed her as much as she would drink at a time.  By the
time my husband got home she was looking much better and acting more like her normal self.  We still took her to the vet though.  At the vet office she actually peed!  :)  which was a very good sign that she was getting over her dehydration.  The vet told us to watch her closely through the night and we did.  The next morning both Nips and Buster were acting like their normal selves again :)
I am thankful that Nips made it through this ordeal.  A lot of gliders become dehydrated and do not make it because the dehydration is not noticed until it is too late.  Since this happened we have constructed a larger, taller cage for our gliders and it would not be possible for our now 2 year old to remove a water bottle on purpose or by accident.