Many things to be accomplished before meaningful aid arrives.
Clearing the roads so the aid can be distributed, rebuilding the the airport and harbor removing navigation hazards, locating warehouses in various places.... rebuilding the FW system and electrical distribution and sanitary systems, building supplies.
Until these projects are well underway, aid will be limited. For now, water and food (MREs) tents and sanitation.
OPINION:
Sadly, even if everything could be accomplished over night, people will complain, the US is not doing enough, the media will do everything possible to make the US look bad and that really p*sses me off.