Dengue fever is a disease carried by mosquitos and while it can be severe for adults, it is deadly for children. It is this rapid plunge in temperature which kills children. So in addition to medicine for diarrhea there is a need for IV solutions to deal with the expected increase in dengue fever and the problem of inadequate supplies of IV solution. The floods mean that such is almost guaranteed to happen. Potable drinking water is very difficult to find in the area.
People normally catch rain water or boil ground water for drinking.
Also with the floods, having a fire for boiling water is particularly difficult in the remote places and for those people stranded in the roofs of their houses. When I was there, health staff were being organized to go out in boats to check on people who are stranded in the outlying areas. They are particularly conscious of the threats of dengue and diarrhea. People are also moving from the flooded areas to higher ground, where such exists. We saw many families building make shift shelters on the highway.