The more groups opting for this bus rental, the better for everyone. This is a winning formula, for those renting because they can save a lot of money, and for New Hope since they will have the bus available as needed throughout the year.    The ability to organize day trips is a boon for local organizations and serves as an important role for at least one of his own group’s programs: the Group Grocery service done in collaboration with CSSS Cavendish, which brings some 60 isolated seniors to a local grocery store twice a week. They receive help in making their purchases and getting around the store. More importantly, they spend time in a valuable social interaction.    The bus has air-conditioning, seat belts, and easy entry steps.“It’s already been booked twice in the first week!” says New Hope’s Executive Director Gerry Lafferty. “The response has been incredible.”