Yes, you are permitted to bring a personal water bottle into Universal Studios Singapore (USS) in 2026. This is a highly recommended "pro-traveler" move, as the tropical climate in Singapore is consistently hot and humid, making hydration essential. The park allows both disposable plastic bottles and reusable stainless steel or plastic bottles. Once inside, you can find complimentary water fountains and bottle-refilling stations located near most restroom facilities and in the queues of several major attractions. It is worth noting that while water is allowed, the park has a strict policy against bringing in "outside food" or large coolers; however, small snacks for children or those with specific dietary requirements are generally tolerated at the security bag check. Bringing a reusable bottle not only saves you money (as bottled water inside the park can be expensive) but also aligns with Singapore's "Green Plan 2030" for reducing single-use plastics. Just ensure your bottle is not glass, as glass containers are prohibited for safety reasons within the park grounds to prevent breakage in high-traffic areas or near attractions.