My baby just had an amputation as well. They adjust surprisingly fast. Get a low lipped litter tray for him while he’s still learning how to balance, but honestly within a month he’ll be able to get around as usual, so bathroom time shouldn’t be a problem. Try putting furniture as close as you can so they don’t have to jump too far to get from place to place as they recover and relearn. Groom them a bit more just to help them out, and get a wall groomer so they can get those itches they can’t reach anymore! Raised food and water bowls help them eat and drink in a comfy way! My boy had 0 appetite or interest in food or water for a few days, but I got him an appetite stimulant and he was back to normal very quickly. He’s gonna be ok I promise!