Yes, rice can be cooked in bulk and cooled without clumping if you rinse it thoroughly before cooking, use the correct water ratio, and spread it out to cool quickly.
Cooking rice in bulk and preventing it from clumping requires a few key steps. First, thoroughly rinse the rice under cold water until the water runs clear. This removes excess starch, which is a major contributor to clumping. Next, use the correct water-to-rice ratio. A general guideline is 2 parts water to 1 part rice, but this can vary depending on the type of rice. For example, long-grain rice typically requires less water than short-grain rice. After cooking, immediately spread the rice out on a baking sheet or large tray to cool rapidly. This prevents the rice from steaming and sticking together. You can also fluff the rice with a fork while it cools to further separate the grains. Cooling the rice quickly is crucial for food safety as well, minimizing the time it spends in the temperature danger zone.
Add a teaspoon of oil or a squeeze of lemon juice to the rice while it's cooking. This helps to further prevent clumping and adds a subtle flavor.