Choose a set of corner cabinets the same height as the sink. Shut the water off and remove the sink. Install the counters in the corner according to manufacturer directions. Add the countertops and screw them in place with an electric screwdriver.
Place the sink into the appropriate cabinet and reattach the water pipes. Use thread tape around the joining ends of the pipes to create a waterproof seal. Screw the pipes together using a pipe wrench. Turn the water on to test the seal. If the pipes leak, disconnect them and clean the ends. Retry the pipe connections until a watertight seal is created.
Measure a point on the wall with a tape measure where you desire the counter to be. Use a carpenter’s level to mark a straight line where you intend to place all the shelf brackets. Screw metal shelf brackets into the wall along the line with an electric screwdriver. Place the shelves on the shelf braces.
Smooth any rough edges down with sandpaper and paint the cornerback wet bar with durable, washable paint. Mount a large decorative mirror above the shelves on the wall. Once the paint dries completely, set up your bar with drinks and glasses.