I've chartered out of Placencia. Where ever you charter from, you need to provision there. There really are no places to reprovision. You can catch or buy/barter for fish, conch, and lobster. We even traded charging a cell phone for a bucket of cleaned conch. Lots of secluded anchorages and great snorkeling. The charts are notoriously bad so keep a close watch on where you are going.
"When in command, command." -- Admiral Nimitz
Difference between a power boater and a sailor out on the water: A power boater is going some place special, a sailor is already there.
s/v Zotz 1981 Pearson 365 Ketch Hull #375