Help little Egg Man's kidneys

Egg was born on June 26th, 2017. His mom was a stray who had six kittens underneath my girlfriend's bed. Egg outlived four of his siblings and now his health is in trouble. My girlfriend and I took him to the vet today to find that his kidney levels are VERY high. We agreed to let the amazing staff at Sunny Brae Animal Clinic keep him for 3 days in hopes that he makes it. They are doing everything they can and we are thinking all of the positive thoughts possible to save Eggy. Anything helps to save our little man. He's a fighter.