Should I be worrying?

[Carterkins]

So last time I bathed Arnold he started drinking the warm water, which I've never seen him do before. Will it not make him ill from drinking warm bath water?

Also, he's not been eating any veggies for over a week now and refuses most of his crickets. I've noticed that the colour around his eyes has faded and he seems tired all the time. I just don't know what to do :/

 

[AHBD]

Could you list his entire set up, including what type of lights you have and the temps.? How old is the UVB bulb, what type is it ? Drinking bath water is fine.