those collared definately could use a drink and some meat on their bones. Are they eating well? I would recommend increasing their food to as much as they can eat. IN conjunction with this, I'd offer them food at least twice a day. Add in some small wax worms, as this can help put some weight on them.
For water...for starters, I'd by a syring and put drips on their snouts, until they lick it off. Once they start licking, they usually keep licking, so you will be able to keep adding water for a good long drink.
For the norm, I put a nice flat rock, with an irregular surface in the cage...I either use ice cubes, or a glass with a tiny hole punched in the bottom (pin-size is just right). I put ice under the incandescent light, or the cup with a hole right over the top of the flat rock. The dripping and running water will usually get them interested.
That little hatchling you posted looks dehydrated. I'd offer water with a syringe 2 or 3 times a day. Check the temps, and be sure you have at least one basking site of 105-107 F. Keep a cool side for sleeping too.
Best of luck,
John (Collared "Dud"