First of all it needs a companion. Try and find it one of a similar age. They don't need to live inside once fully feathered, they can go outside in a secure area, with a house or shed for nighttime. But if you really want to keep it in the house then puppy pads are quite good. But it must have drinking water available all the time. You can give it a narrow necked container for drinking out of but twice a day offer a larger shallow bowl so it can have a good wash. Absolutely essential for ducks.