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Under California law, while the serving a drink with a foreign object would be considered "negligent", you have no legal liability to the customer because no damage resulted.
Had the screws been ingested and the customer injured, you would be fully responsible for the medical care and other direct damages.
However, without injury and no damages, there is no legal liability.
Of course, you may want to go the extra mile to prevent any bad publicity, but other than refunding the purchase price, you have no legal obligation to compensate the customer further.
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