I am sorry to hear of Filou's illness, but be assured that your tender care will give him added time to spend with you. Yes, learn to rehydrate him yourself--that way he won't have to go for rides in the car (icky!). Get a copy of the book "The New Natural Cat" by Anitra Frazier -- an excellent book about care-giving for sick cats. Both people and animals can live good, comfortable lives even if their kidneys are failing. It is not a painful condition (so I am told and believe), and your love and care will continue to make his life blessed, just as he has blessed your life.