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Hello, my name is***** and I will do my best to help you. I'm reviewing your question now and I will post back to you ASAP.
Caspar sounds very sick. Your new kitten was not there long enough to make Caspar sick.
Was there any vomiting or diarrhea when he started getting sick?
Is he an outdoor cat?
By now Caspar must be quite dehydrated. And not eating will make him weak.
Perhaps you have already taken caspar to an emergency clinic. That is what I would recommend because he in such critical condition.
I hope that everything turns out well.
If you come back to site we can continue this chat.