How To Put A Kitten To Sleep Immediately?

okay so i have a 7 week old kitten but he is really sick and the vet said he has parvo (parvo like) and need to put him down asap. She thinks it could be contagious to our other cats. So we were wondering how long you think we should wait to put him down? Obviously, I don’t want his body laying around my house for too long and doesn’t want anyone else getting infected also. Im just trying figure out what would be best for us since im not able at the moment to take care of him anymore! This is really hard on me knowing that we can’t afford anything right now!!

What kind of kitty litter do you use? We currently use Arm & Hammer crystals litter with clumping action…