P-29, r. 1 - Regulation respecting food

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11.12.4. Milk offered for sale directly to consumers must be placed on sale or served only in the original container filled at the plant or from that container.
Despite the preceding paragraph, milk and cream added to beverages or cereals in a restaurant with table or counter service may be offered in a serving container other than the original container provided
(1)  the serving container is filled from the original container immediately before serving; and
(2)  the unused portion is discarded at the end of the meal.
O.C. 741-2008, s. 15.