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I suggest to use clear caulking around the sink. It all depends on how big of a gap your talking about.
Demand he pay for proper repair, and consider taking him to Small Claims Court if he won't pay.
You will need some kind of a backer under the counter top or the caulk will fall through.
Also consider placing stick on floor tiles onto the shelves in the cabinet. They are cheap, easy to cut and protect the shelf from water damage, leaks and spills.