No, you cannot bring a full Hydro Flask (or any other reusable bottle) through Disneyland security if it contains a beverage other than plain water. While Disney highly encourages the use of reusable metal bottles like Hydro Flasks to reduce plastic waste, security protocols require that all large containers be inspected. If your bottle is filled with a colored liquid or something that smells like alcohol, you may be asked to dump it out before entering. To avoid delays at the "Evolv" security scanners or the bag check, it is a "pro tip" to bring your Hydro Flask empty and then fill it up at one of the many "Water Refill Stations" located throughout the parks. These filtered stations are found in Galaxy's Edge, near the Tomorrowland restrooms, and at almost every "Quick Service" dining location. This ensures you comply with safety rules while still having ice-cold water all day. Remember that glass containers are strictly prohibited (except for small baby food jars), so your metal Hydro Flask is actually the perfect, most "Disney-approved" way to stay hydrated in the California sun.