FIP Treatment for Pi’erre

Pi’erre is my 1-year-old cat who was recently diagnosed with Feline Infectious Peritonitis (FIP), a feline Coronavirus with a 100% mortality rate without treatment. Within hours, he went from active and playful to lethargic and unable to walk without falling due to severe brain and eye inflammation. We started his treatment about a month ago, but initial diagnosis and treatment over the 84-day course are not cheap, easily totaling over $2,000. Any contribution to the treatment would be greatly appreciated by Pi’erre and myself, even $1.