The National Voluntary Organization Active in Disasters (VOAD) has information on the best way to help communities after a disaster.  National VOAD members are currently responding to these major events:
Hurricane Maria
Hurricane Irma
Hurricane Harvey

They strongly discourage sending unsolicited supplies and equipment to disaster areas.  In many cases these donations strain the logistics system, and require volunteers to devote additional effort to store and manage these donations.  As VOAD notes, “While all donations are appreciated, CASH IS BEST. ”

Visit their site for more information on the best ways to help communities.