From the Wash Post: With thousands still in shelters, FEMA’s caution about temporary housing hinders hurricane recovery, An excerpt:

The triple-punch of the three hurricanes has created a housing challenge for FEMA that is unmatched since Katrina. In Texas, an estimated 1.2 million homes were damaged or destroyed. In Florida, where estimates are still being tabulated, the number is already in the tens of thousands. In Puerto Rico, about 250,000 homes were damaged or destroyed.

From Bloomberg News: HUD Explores Temporarily Housing Puerto Ricans on U.S. Mainland

Update on Nov. 1:  Here is the FEMA info re transitional housing available in the U.S. mainland.