There is a statute against consuming alcohol while operating a motor vehicle. You will not get in trouble for that. If there is a local ordinance against having an open container of alcohol in a moving vehicle, that could be problem for you. I would discuss the situation with your employers.
Depending on the arrangement, your worst case scenario is an open container violation. You need to speak to your wealthy employers about hiring a lawyer to explain to them how they can enjoy their wine AND your chauffeur skills in an on-going way. There are ways for you to serve your employer and not have the risk of an open container ticket.
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