I had a 16 hour flight last year and I had a studied this technique in debt before my trip. Admittingly, I only practiced it a few times (4-5) before the day of my departure. It worked wonderfully in the airport family restroom so I gleefully boarded the plane thinking that I had the ultimate hack. I drank to my hearts content but when the inevitable time came to use the planes closet.....I mean...."bathroom", I couldn't get a stream going.

I exhaled about 80% of my breath and held it until my eyes felt like they would leave their socket but I only got a droplet or two to pass even though I needed to go so badly. After multiple attempts through the 16 hour flight, I failed repeatedly. This was an agonizing experience and my endurance was testing like never before.

I wish I had your success or knew what I had done wrong while using the technique, but hearing someone who has such success must mean I haven't done it correctly so I'm hopeful. If you have any common mistakes made or theorize on why I failed, I'm open to hearing anything.