Meh... there are plenty of good drugs out there they could give him that have the same impact on the brain as pot..... or they can give him pot..... my point being this sounds more like a stunt than a medical prescription.
I'm not sure where ChrisK lives, but we have lots of water around here. Folks even use it to make coffee at Starbucks, fill swimming pools, brew beer, wash their cars, water their lawns......