2 pounds confectioners' sugar (maybe a little bit more- so get an extra bag just in case)
start off with 2/3 cup of water (you will need to add more)
1/2 cup plus 2 tablespoons of meringue powder (I use the wilton brand and they have it at walmart or your local cake supply store... our's is AC MOORE or Michael's)
1/2 teaspoon of vanilla
gel paste in the colors you would like to use
First mix sugar water and meringue powder in your mixer on low. (Mix this nice & slow at first... or you will have a puff of sugar all over the place...) Your icing will probably be thick, so add water (a little at a time) until you get the consistency you are looking for. I like to keep the icing on the thicker side. But thin enough to pipe designs on my cookies. Next, if you would like to make the icing a different color- add your gel paste a little at time until you get the color you are looking for. I divided the icing into a few different batches and made a few different colors for my cookies.
You can either use this right away- or refrigerate up to a week.