When they had taken out my catheter they told me to drink much water and prove that I was able to urinate on my own and without problems. They gave me two hours.
Well, it didn't quite work and my two hours were running out quickly. I desperately wanted to avoid getting the dreaded thing back in again.
In my distress I remembered that too much strong, black coffee had always quickly sent me to the restroom without fail. So I made myself two large cups of instant coffee with pouches I had hoarded during my week in the hospital, poured it down as quickly as I could, and changed my life forever!
Now I will never be able to complain about getting another catheter and how it hurt me, but then, you can't have everything in life...
Remember this evasive maneuver, it may save you some day.
BTW, cold feet also do that for me (send me to the restroom often), but you can not have those in Thailand ;-)