Clean Water Food and Shelter for the world, fly's estimate

approximately US$10b annually for basic water and sanitation services and an additional US$15b to US$20b annually to provide a higher level of service and to maintain existing services.
--http://blueplanetnetwork.org/water/facts

The United Nations has estimated the cost of ending world hunger at about $195 billion a year. Twenty-two countries have pledged to donate this money by contributing 0.7% -- less than 1% -- of national income to international aid, but the goal has yet to be reached.
--http://www.squidoo.com/world-hunger

With the shelter cost of under $2 per person per day, there is now inherent affordability and dignity by the homeless themselves paying for shelter and showers. (2000 Dollars Each!)
--http://worldshelters.org/for-us-unsheltered/municipalstate-agency