My 2 year old pug has had vomiting issues that we've tried to tackle from a variety of angles. At his worst he was drinking a bunch of water and throwing up immediately afterwards. We were constantly taking him to the vet, and on the last visit she gave him a pepcid shot, an anti-nausea shot, and a water/electrolite pack under his skin that would keep him hydrated as we had him fast for an evening. For the next week we gave him a vet prescribed bland-diet of rice and cottage cheese. That and hypoallergenic food from then on seems to do the trick.
Maybe he has developed a food allergy? Also, he might be eating too quickly. Is there bile in the throw-up, or is it just the food? Just the food suggests he might be eating too much too fast. If he is immediately throwing water back up, cut the water and food for a bit to give his stomach time to settle.
The best thing you can do for him is get him to the vet so they can test him for stuff, though.
"Well Husband has decided to try Cider again, guess what Julie, the first one he had was Angry Orchard from the States which got the thumbs up, his next lot has been two home grown ones as in Scottish, Thissly Cross, he liked them as well, his next…"
"I will forever miss you my sweet little man,you came into my life and stole my heart and the day you left,you took a part of it with you,run free across that bridge with you sisters and brother run,romp tll we meet again.R.I.P My Golden Treasure."