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I am sorry to hear you are worried about Spunky. My name is Rebecca. I am a veterinarian and will do my best to help.
I would choose the prednisolone over prednisone; some cats do not metabolize prednisone. It would be safe to switch to prednisolone after giving the two half doses of prednisone. Cats are pretty resistant to the side effects of these steroids.
How much are you giving, in milligrams (mg)?
Good he is drinking. Try to get him to take milk, broth, or tuna juice if he will drink.
Let me know if this is helpful and what other questions I can answer for you.