Require all coffee shops to install Japanese style toilets ( grey water) and save water
Install a small sink on top of the toilet. When the patron flushes the toilet the water first comes through the tap. see the sinkpositive site http://sinkpositive.com/site/home/ or this you tubevideo http://www.youtube.com/watch?v=7kulnVSG0FY&feature=related
for an example. Installed in restaurants and coffee shops this would save space and save hundreds of litres of water a year.
While this fixture is not specified in the Draft Greenest City Action Plan, ensuring people use the most efficient fixtures possible is. This type of fixture could be one of many options.