Offer water when you have time to walk him later. For example: when u wake up give him water, then before you leave the house let him outside. I also train puppies with a pee pad (just one) leave it out so then if you catch him in the act you can set him on it. Pad location is important too keep it in one spot.
Yes, see the vet, take your dog for walks. You can clean the area with a product called Nature's Miracle, available at pet stores, it is an enzyme cleaner good for getting rid of that smell.
Go see a vet, your dog may have a urinary issue.
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