You may want to ask your vet about medical boarding the puppy for the day for about 2 weeks So that way someone is always watching the puppy. there are so may things that can happen with a puppy that young. I hope you do have a vet, just ask them for advise on food and water.
If you do keep it in the bathroom buy a baby gate, do not close the door on a new puppy and keep the radio or TV on, so it does not feel alone.
good luck.
