Blend the soup: Add the corn kernels, water, garlic powder, salt, and pepper to a high-speed blender. Blend for 2 to 3 minutes, until completely smooth and glossy with no visible flecks. If using a regular blender, food processor, or immersion blender, blend as long as you can, then pour the soup through a fine mesh strainer, pressing the solids with a spoon.
1⅔ cups corn kernels, 2 ¼ cups filtered water, 1 teaspoon garlic powder, 1 teaspoon salt, ½ teaspoon pepper