I used to work in a cafe attached to a health-food grocery store, and we had similar rules governing people who would purchase food in the grocery store and then come sit in the cafe to eat it. Mostly it wasn't a big deal, but at least once a week we'd run into the problem where someone had purchased a bottle of wine from the store and wanted us to open it for them and provide a glass. The best we were allowed to do was put a bottle opener on the counter so they could open it themselves, and point them to the free plastic cups for water over by the soda machine.
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