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HI this is dRB and I would be happy to help you. Are you trying to find out how to make your kitty comfortable until you can get to your vet?
If he is 18 years old with thyroid cancer there may be nothing you can do to get him without medical intervention. He may need a feeding tube which I would not do to an 18 year old cat with cancer. Or you can ask your vet for some mirtazapine to try and help his appetite. But you may need to consider putting him down.......does that make sense?
Are you there?
Since I am not hearing back from you I will opt out allow another expert to help you. Sincerely, DRB
JACustomer, are you still in need of help? Is your companion willing to consume anything? Water? How long since he last ate?
I am so sorry to hear of your loss.