Have your 2 year old shower with his father. Give him a cup to collect the water.
Have the 2 year old then place the cup underneath the water dispenser (dad's scrotum) and gather the water as it drips off.
If this is too strong for you, try having the 2 year old collect the dripping water off his own scrotum and drink!
Note: There was no actual drinking of the shower water, thanks to dad's quick reaction. This was a funny thing to see in the shower. And that is why Aiden no longer showers with mommy! Can you just imagine?