The cast of “Grown Ups 2” apparently has some very specific demands when it comes to beverages. We’re told Salma Hayek , for example, will drink only Fiji Water – and preferably by herself. The other day, Hayek, accompanied by a bodyguard and two Marblehead police officers, stopped into Coffey Ice Cream in Marblehead, and the door was promptly locked so the actress wouldn’t be bothered by locals. Adam Sandler, meanwhile, is partial to Smartwater and David Spade will drink only TAB cola. (Do they still make that?) The cast and crew were shooting yesterday in Swampscott.