Since your question contains multiple layers of shortages, you will need to break it down. Shortages also shift. A few places to start:
Food and Agriculture Organization of the United Nations: http://www.fao.org/home/en/
Washington Post's comprehensive section on the global food crisis: http://www.washingtonpost.com/wp-srv/world/globalfoodcrisis/
Here is a list of books in our library that could address your question: http://unomaha.worldcat.org/search?q=food+and+water+shortage&qt=results_page&dblist=638&scope=2&oldscope=2#x0%253Abook-format
CQ Researcher will also have several articles that include data charts: http://leo.lib.unomaha.edu/login?url=http://library.cqpress.com/cqresearcher Unfortunately, I can't directly link you to them, but you can enter your search term (such as global food crisis, water shortages, etc.) to pull them up.
