Chill small mixing bowl and beaters. Soften gelatine in orange juice. Stir over hot water until completely dissolved. Remove from heat; stir in next three ingredients. Using cold bowl and beaters, beat dry milk and water until soft peaks form. Add lemon juice and beat until stiff. Fold in orange juice mixture. Spread on 8 double crackers, top with remaining crackers. Freeze until firm (about 2 hours). Wrap individually in foil and store in freezer.