To achieve perfectly loose rice for meal prep, the secret lies primarily in rinsing away the excess surface starch and using the correct water ratio. For long-grain white rice, use a ratio of 1 part rice to 1.5 parts water.
First, place your rice in a fine-mesh strainer and rinse it thoroughly under cold running water until the water runs completely clear. This removes the loose starch that causes clumping. Next, bring your water to a boil, add the rice, reduce heat to low, cover with a tight-fitting lid, and simmer for about 15 minutes without stirring. Finally, remove from heat and let it steam covered for 10 minutes before fluffing gently with a fork.