That was my concern too, that Panacur isn't that effective for coccidia, even though it's apparently used (per searches I did, I've not dealt w/ coccidia in my snakes).
On the hydration issue, that's where the tube-medication would be the superior method....and probably what I'd do, though by all means get another vet opinion.
As you said, is all this really necessary? I cannot answer that....I wish I could. I hope you get more credible input.