One thought for the chips, maybe pre book your cab with Wilfred Brooks and ask him to pick up the chips for you on his way to you, so he has them when you meet at the airport?!
Then all you have to do is shop for drinks at the dock. Note - best price on the island this winter for Ron Zacapa 23 was at the liquor store at the dock - also liked the store had bag in a box agricole rum - 3 or 4 litre's, thought it was funny, but would be practival for a crowd on a charter boat

J&B