Great. Thanks for the additional information. I really appreciate it.
The good news is that he didn't drink much and he is purging his system by vomiting. This is good because it will keep him from having diarrhea (although he still may have a little) or developing pancreatitis.
If this were my dog, I'd fast him for 24 hours (providing he doesn't have any underlying diseases such as diabetes that require he eat every few hours). No treats, no food, nothing. You can leave a small amount of water available, but don't allow him to drink too much at one time (placing ice cubes in his bowl so that he can't gulp water will help).
After the 24 hours, I'd offer a bland diet of boiled rice and boiled hamburger (3 parts rice to 1 part burger) in VERY small amounts (perhaps 1/4 c every hour or so) for the next 24 hours. Once you start feeding the rice mixture, monitor the dog for recurring vomiting or new diarrhea. If the problem doesn't start again, you can begin slowly mix in his kibble over the next few days until you're back to just kibble.
If the vomiting doesn't stop, or if he becomes lethargic, anorexic or any other symptoms, then you should have him seen by an emergency vet immediately. If you're not sure where one is near you, you can go to: http://www.vetlocator.com and plug in your zip code. They'll point you in the direction of the one nearest to you.
I hope this helps.