For a disaster in your country :-

Contact your National Society for information on the relief items needed (clothing, non perishable goods etc), how long the collection drive will run for, or how to make a financial contribution (bank account number etc)

For a disaster in the Caribbean :-

Items, perishable or non-perishable, are not accepted or collected.
Past experience has proven the logistic costs (shipping and handling, in-country transportation etc) are better invested in purchasing the relief items specifically required in-country.
Financial contributions are prefered.