Make cake batter as directed on box, adding almond extract with the water. Divide batter in half. Stir 2 drops blue food color into one half; stir 2 drops red food color into other half. Pour into pans. Bake as directed on box for 8-inch pans. Cool 10 minutes. Run knife around sides of pans to loosen cakes; remove from pans to cooling rack. Cool completely, about 1 hour.