Yes, You Can Bring Your Own Food To Disneyland - But There Are Rules - Tasting Table
Briefly

Bringing food into Disneyland can lead to significant savings compared to park food prices. Guests are permitted to carry food and beverages as long as they inform security at entry. Guidelines state that no glass containers, foods requiring heating, or pungent odors are allowed. While coolers are allowed within certain dimensions, they must be stored in lockers. Ice packs can be used to keep food cool. Ideal packed items include breakfast foods like pastries and canned goods for lunch, which don’t need special storage.
Guests are allowed to bring food and beverages into Disneyland as long as they notify security before entry. Restrictions include no glass containers and no foods requiring heating.
Packed lunches, especially canned foods, are ideal for a Disney park day since they do not require refrigeration or reheating before consumption.
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