How do I prevent further water damage around my kitchen sink?


The hole for my drop-in kitchen sink was made a little too wide in places, so water falls through the slits to the cabinet below. He also left deep gouges in the new countertop, on the right side, close to the backsplash area. Was thinking of using a silicone caulk to seal the gaps. Is there a better way to fix this? Can't afford to replace that run of countertop. Don't want any water damage to continue. (Was told it was a "pipe leak". He's been fired.)

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