Native New Hampshirite, Drew, donning shorts, never let cold water get in the way of a good time. This weekend, Drew and his wife, Kaitlyn, expecting their first child, planted other babies—baby oysters—in the Great South Bay. They had help from fellow Sayville Rotarian Dave Fallon, Demetrius Caroussos of Cornell Cooperative Extension, and Andy Mirchel from Save the Great South Bay.  For the past two years, Drew led the Sayville Rotary’s oyster nursery project at the Sayville Yacht Club.  As part of the collaboration, volunteers cleaned cages and measured oysters throughout the summer.  A total of 90 percent of the oyster population has been lost worldwide.  Local groups throughout the South Shore are committed to bringing them back. Oysters mature in a single summer and purify 50 gallons of water a day.   They fuse together as they grow, forming rock-like reefs that serve as a habitat for marine animals and plants.