Generally, no, you cannot bring outside food or drinks (especially glass containers or alcohol) into the Mandalay Bay Beach or pool areas. Security at the entrance typically checks bags for prohibited items to ensure safety and to protect the resort's high-volume food and beverage service. Guests are expected to purchase refreshments from the onsite bars, such as the Beach Bar or the various poolside service stations. However, most Las Vegas resorts in 2026 allow guests to bring a personal, non-glass water bottle to stay hydrated in the desert heat. For a more private experience where you might have more control over your environment, renting a cabana often includes a stocked fridge or dedicated server, though it still falls under the resort's catering policies.