My dog drank water out of a puddle with oil in it what will happend to my dog?

That would depend greatly on the type of oil. If it was something like olive or canola oil in large quantity, he would likely have loose bowels and an upset stomach for a while. If it was something like motor oil, the results could be more serious. In this case, you would need to contact your vet and let them know exactly what the dog drank and how much. They will let you know if they need to see him, or what type of first aid to proceed with.