Michael seems to be pushing really hard to fly away. Getting people to pack up etc. But, I do not get the impression its recon. They are obviously worried about weight so that means not a lot of extra water.

Three tours in Iraq and Michael has to know the importance of water. Lack of water can kill more quickly than zombies, because one cannot hide from lack of water and no mater how many times it is shot, the threat of lack of water is not diminished.