Yes, you are allowed to bring your own food and non-alcoholic drinks into Disney World. This is a popular way for families to save money and manage dietary restrictions. However, there are several strict rules: you cannot bring food in glass containers (except for small jars of baby food), and the items must not require heating, reheating, or refrigeration by Disney staff. Additionally, you cannot bring loose ice or dry ice; you must use reusable ice packs or put ice in a sealed Ziploc bag to prevent leaks during security screenings. Coolers are permitted but must be no larger than 24" long x 15" wide x 18" high. When you enter the park, you must inform the Security Cast Member that you are carrying food. This policy applies to all four theme parks and both water parks, making it easy to pack sandwiches, snacks, and bottled water for a full day of "Disney on a budget."