To store for just 2-3 days, store them unwashed in the bag in the fridge. First method: To store them longer, rinse and get rid of rotting and discolored sprouts, then transfer them to an air-tight container with a paper towel in the bottom. The paper towel will absorb the moisture. Second method: Fill the container with water to keep all the sprouts immersed in water. This will keep it fresh for about a week.