Here ya go, no screws, nuts, bolts, or blueprints required. Just 4" pvc and a couple of bungee cords then a little spray paint.
From top to bottom it is a cap, straight pipe, Y, and screw-in plug. The longer you make it the more food you can put in it. If it is too tall just undo the top bungee cord and tilt it to fill. These are really hard for people to spot and vandalize. If they do...the thing didn't cost much to make anyway so it isn't so bad.