Definitely a
bath once a week at least - try splishing the water gently by wiggling your fingers in it, and dripping water on the end of his nose when he's in the
bath - he'll start licking it off his lips, then start lowering his head into the "moving" water to drink more easily. All my gang, when
thirsty, now happily drink straight from the
bath.
You can also offer smoothies by syringe - I use a high quality baby food (they particularly like the butternut squash puree), to which you can add a little vitamin powder, calcium, any other supplements, a little more water if necessary for extra
hydration, then gently "dib" it on their upper lip using the syringe tip.
Tsam gets particularly excitable when a tube-o-tasty-paste arrives - he'll gleefully grab hold of the syringe so I can squirt a big glob gently into his mouth for him. He likes puree-time, nearly as much as raspberry time!
Oh, which reminds me - melon. Almost every dragon I've ever met
LOVES sliced melon. Nice, easy to grab strips go down a real treat, especially in the summer.