According to the sources provided, it is safe to take Lipitor (atorvastatin) with or without food, but it is not recommended to take it with grapefruit juice. There is no specific mention of taking Lipitor with milk. However, it is important to note that milk may affect the absorption of some medications, so it is recommended to consult with a healthcare provider or pharmacist before taking Lipitor with milk. It is also important to follow the instructions provided by the healthcare provider or pharmacist regarding the administration of Lipitor.

Sources:
[1] Drug Patent Watch. Lipitor. https://www.drugpatentwatch.com/p/tradename/LIPITOR.
[2] WebMD. Lipitor. https://www.webmd.com/drugs/2/drug-3330/lipitor-oral/details/list-interaction-food.
[3] RxResource.org. Lipitor. https://www.rxresource.org/consumer-information/lipitor.html.