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The water is drool from the nausea. His drool is dropping out of the mouth because he doesn't want to swallow with the nausea. This can also happen if he licked something irritating like detergent or chewed on plant that causes burning of the mouth. OR flea treatments/sprays, etc.
My recommendations if to put him in the tub and rinse his mouth out real well (he won't like it). Pull up his food and water for now and give him 25 mg of Benadryl.. .and hope it stays down. Benadryl does have anti-vomiting properties. If the vomiting stops you can introduce water tomorrow morning..and food (bland rice/chicken) by mid morning if it is all held down.
The problem is if there is something bothering his mouth the water is to dilute. Like dandelions if chewed on can burn the mouth...they will drink in order to naturally rinse the mouth and help with the irritation.
You don't have to pull the water if you think the dog is keeping it down. If it is just the drooling and water...just let him sleep. If the vomiting returns try the benadryl AND if this all passes...please try to get your dog in for the remainder of his vaccines...for his own protection.Dr.V