AYes, Disneyland Park allows visitors to bring food and drinks from outside, with certain exceptions. Most snacks or pre-made food items are allowed. You can also carry beverages provided they are not in glass containers. Any item that requires prepping or heating will not be allowed inside the park. If your meal needs to be prepared or refrigerated due to medical or dietary restrictions, the park will make an exception, if the items fit inside a small collapsible cooler.