In a medium bowl, stir together the egg replacer, water, and almond extract. Stir until combined.
Add the powdered sugar, one cup at a time, stirring until a spreadable consistency is achieved. If icing is too thick, add a smidge of water. However, if you add food coloring in drops, that will add moisture to the icing too. Keep a mister bottle nearby and mist the frosting if it thickens.
Add food coloring to achieve the desired color intensity. Once cookies cool, either dip them in desired icing colors or fill squeeze bottles with colored icing. Decorate cookies and then allow them to sit for 2 to 3 hours up to overnight.
For the best consistency for flooding/filling, if you pull the spoon out of the bowl, the icing that drizzles off the spoon should hold its shape for several seconds before dissolving back into the rest of the frosting. If it's too thin, add a little bit more powdered sugar.
To decorate cookies: First, pipe the outline, then fill. Drop the cookie a few times on the counter, or use a toothpick to smooth the icing until it evenly distributes across the cookie.
Once the frosting sets, pack them in an airtight container. They will keep 4 to 5 days at room temperature or up to 10 days in the fridge when stored correctly. They can be frozen for up to 2 months.