Sarah over at Sarah's Bearded Dragon Rescue (a great blog about nursing sickly/neglected beardies and some other lizards back to health) has successfully trained her beardies to drink from their water bowls.
http://sarahsbeardeddragonrescue.blogspot.fi/2016/09/drinking-from-water-bowl.html
http://sarahsbeardeddragonrescue.blogspot.fi/2016/09/drinking-from-water-bowl.html