I was once washing my penis and I strecthed the foreskin and washed it with water by pouring the water fast in huge quantities. I felt a sudden pain as if water had gone into my penis. What if the water gets into the penis? Any problems will occur?
The main problem is pain, as you found out. There is no reason to put water inside the urinary tract. The water may introduce bacteria. If a bit of water gets in the penis when you bathe it is OK. Just don't force water into it.