Add the sugar, meringue powder, corn syrup, and almond extract into a large bowl.
Slowly add warm water to the sugar mixture and blend on low speed until you've reached your desired consistency. Adding more water will make it thinner and less water will keep it thicker.
Place the royal icing in an airtight container with a tight-fitting lid. No need to refrigerate.
Video
Notes
Notes-For the outlining and details, a thicker consistency icing is required.For flooding, a thinner consistency icing is required.I always like to keep a thicker AND thinner icing (in premixed colors) handy. Then, as needed I can thin the thicker icing should I need additional flooding icing.