YAY my first tutorial! Thanks for all the +favs Make SURE if you want to add the final duplicate modes at the end you COMBINE ALL THE LAYERS FIRST.
Otherwise you'll screw up somewhere along the way. Even if you're just wanting to reduce the amount of layers to ONE, follow the method below!
Merge blue splotchy layer down to body of water
Delete the now empty middle layer
Merge the white splotchy layer down to blue splotchy body of water
Delete the now empty top layer
White splotchy layer down to blue splotchy layer
White + blue splotchy layer down to body of water
Deleting the empty top and middle layer
The incorrect way will ruin your white splotchy layer mode and your blue splotchy layer opacity. If you have any questions or you run into any problems, do ask!
the following deviations of mine are as shown--
hope this helps!