i put a beardie in about 2 inch's of water last year, she put her head under and appeared to be sleeping....3minutes later up the head pops for a look around lol....must try find the vid
prior to this i had had one do this for over a minute but i pulled her up :oops:. but yes from what i have observed they do seem to really like a good swim and sometimes to just sit an bath/soak it up
you just dont want too much water around permanently, a shallow dish for drinking is plenty, they may use it as there toilet so small is best so you can clean/freshn up every day. I find if i have salad in there every day they dont drink neally as much and vice versa...too many baths and not alot of vege gets eaten
veges is best....moderation is key i think.