I would implement a policy in my country Australia, on World
Water Day 2020. By then we should have a decent government. On the day, a 'Rally for Water' will be held in the city.
My idea is to use the NSW desalination plant, which is currently running at less than 10% capacity, to operate at 100% capacity, and bottle that drinking water, which can then be destributed by aid charities to where it is needed. There is no point in investing millions of dollars into a plant that is working hugely under capacity, when there is a need for water elsewhere!
*edit* The bottles used could be made out of recycled plastics. A good system would be to have somewhat larger bottles, like those found in offices, that are returned after they are used, and refilled. Each zone that will be supplied will have a fixed amount of bottles per day. If at the end of the day, they do not retun all of the bottles, they will recieve less the next day (only for one day, otherwise it defeats the purpose of the exercise). This will provide an incentive to the people to take care of the bottles, and therefore lower overhead costs.
It seems harsh, but they will no doubt appreciate the water.