In a small bowl, combine water and gelatin; stir until gelatin is dissolved. In a medium saucepan, heat oil over medium heat. Add celery and onion; sauté until tender. Add remaining ingredients; stir until well blended. Bring to a boil; remove from heat. Stir gelatin mixture into blackberry mixture. Store in an airtight container in refrigerator. Serve with meat or bread. Yield: about 2 cups chutney.