Any time I hear anyone worrying about or see a dog vomiting or have diarrhea I automatically suggest switching them to a bland diet of chicken and rice. I usually prepare my own which is very economical.
It usually takes 3-4 days of this diet to work whatever is in their system out, but you should see improvement within 12 hours of starting them on the diet. If not, seek the advice of a veterinarian.
When I first started preparing the whole chicken, I used a whole chicken and boiled it, let it cool, and then spent a lot of time making sure all the bone and cartilage was removed. Then I got smarter and started using just thighs! So much easier to clean and they are every economical too. (side note: my husband and I love thighs for our meals as well! Very tender and tasty!)