my kittens and cat got feline parvo/ feline panleukopenia

a highly contagious and highly fatal disease, so far 1 has died due to me believing she ate something toxic as did the vet, except this time i took a kitten in a she got diagnosed and one other kitten is sick as well, the adult cat looks sick now as well and other kitten look fine but as said above highly contagious and they all run around together, the kittens are 4 months the cat is 9 years theyare my everything i am currently in a very rough spot and could use some serious helpif at all possible it is very expensive for supportive care which is 50/50 they survive and is 500-600 dollars i dont know if there is anything better than that will update this story with better information and more coherent later when more clear headed Edit:never added their names, they are artemis female the one with thick white forhead stripe,punkie female full tabby,moo female adult tuxedo?,and uno male tuxedo? And theone who sadly passed away, the other white forhead stripe with thick cheeks was animal rip her my darling another edit: if you want to check up on them or see videos of them contact me at my instragam frenchvanillachikenwings or however gofundme llows contacting the money will be used for supportive care and if there is anything better than supportive care the rest will be for that if that is feasible like overnight care or meds, dont know quite what else to put but ill probably think of something later, if i missed any information that is crucial to know or would just like to know please contact me IF YOU NEED TO KNOW THE VET IT IS ONPOINT URGENT VETINARY CARE 3415 East Silver Springs Blvd AND IF FOR DOME REASON THEY ARE UNAVAILABLE I WILL BE USING UF URGENT 24HR ANIMAL HOSPITAL