The straw holder kept the straw from traveling and made drinking much less frustrating.
Step 1: Cut and Glue
Find a piece of plastic tubing the right diameter for the straw and cut it to the appropriate length.
Run a straw through the tubing while you glue it to the clothes pin. That makes sure the tubing will be straight after the glue sets.
When the glue sets, clip the clothes pin to the edge of the glass and run the straw through the tubing.
Now, it ain't going nowhere!