In a medium sized bowl, mix together the sour cream, water, and eggs. Stir in the cake mix until moistened. The batter will remain slightly lumpy.
Spread the batter evenly in the jelly roll pan.
Drop the pie filling by spoonfuls over the batter, trying to evenly disperse the cherries throughout the batter.
Bake until the cake springs back when touched lightly 25-30 minutes.
Cool on a baking rack.
In a small bowl, mix the confectioners sugar, softened butter and almond extract. Beat well. Add in the milk starting with 2 Tablespoons, adding more if necessary until the glaze reaches the desired consistency.
Sprinkle with sliced almonds and drizzle with glaze.
Notes
When choosing a pie filling, the "more fruit" varieties are best for this recipe.