What do I do when my pup has been sick 2 days in a row?

My pup is 16 months and he has been sick 2 days in a row ( white yesterday and yellow today) both times only once I have no ideas what I can do im visiting family have been since the beginning of the month but only now he's being sick any info on Google says call a vet after 3 days but I don't have vet money its crazy expensive and im no where near his vets i know if its poison it needs to be chicken and rice (been told from a friend that had a dog poisoned)
What do I do when my pup has been sick 2 days in a row?
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