Pick one high quality dog food, and stick with it for a week. That should settle the GI track down. Puppy might go on a hunger strike begging for your human food. Don't give in.

If the dog does not start to eat within 48 hours, then make an appointment with the Vet. Since you just adopted puppy dog, it could have parasite problems that needs medical attention. But give it a couple of days first.

P.S. Usually there is no harm in giving a few table scraps to a dog, but human food should not be substituted in for a quality dog food.