I envision a group/organization to be among the first in when disaster strikes. The objective will be to determine what water resources are available and the quality of those resources. In most events there is a tremendous need for clean water for drinking, cooking and cleaning. Many disasters are accompanied by water borne diseases such as dysentery and cholera. These diseases are easier to prevent than they are to treat.
One technician could be first in to perform analysis of existing water sources and determining how best to treat/condition the existing water sources to provide a clean potable water source, or sources. The equipment and materials to clean the water are less expensive to transport than water that must be shipped in, and would provide and ongoing supply of water.