I just use tap water, as for feeding, use small crickets. Try to give ones about as long as your T's butt. A 3/4" rosea should be able to take down 1/2" cricket.
If your vagans is really small them give it pre killed crickets, remove if not eaten overnight.
You can try to feed tonight, my T's ahve always taken food right away. Of course if they don't eat overnight the remove the cricket.
What do you have your guys housed in?