Hi Dick,
I hope that if your assignment is just 6 months, it will be the 6 that are the coldest in Tonawanda (this from someone who spent many years in Attica and knows what 'lake effect' is all about

)
The British Virgin Islands do not, to my knowledge or that of the IOA, have an ostomy support group. You might learn of some contacts there through the "ia" (Ileostomy & Pouch Association) of the UK - see their contact page at
http://www.the-ia.org.uk/uni_contact.aspx .
As for suppliers, contact the international divisions of the major pouch makers to learn what distributors they work through there:
Coloplast: Link for their "Export Region"
http://tinyurl.com/349l36
ConvaTec: within the Caribbean section they show only this staff person: beatriz.torres AT bms DOT com Tel: 787-774-2880 (in Puerto Rico)
Hollister: shows only distributors in the Dominican Republic and Puerto Rico, in the area. This PR-based company might know how ostomy items are supplied to residents of the Caribbean.
Puerto Rico Hospital Supply, Inc.
Ave. Rosendo Vela Acosta Lote 4
Jardines Industriales de Carolina
Carolina, Puerto Rico 00987
Telephone: 787-622-5151
Fax: 787-622-5156
Since it sounds like a temporary posting, you might find it simpler to continue to purchase supplies stateside and have them shipped to you.
Good luck - and don't forget to let us know how it goes!
Linda in NJ