Help Coconut Fight FIP

Hi, my cat Coconut has recently been diagnosed with FIP (Feline infectious peritonitis). His blood work is abnormal, and his X-rays show fluid around his organs. FIP has a 100% mortality rate if not treated, and treatment is hard to find and very expensive. My baby is only 1.5 years old. I want him to survive. Please help me get started on treatment. Anything would be greatly appreciated ❤️