Bring water and margarine to a boil in a saucepan; stir in stuffing mix. Cover and remove from heat. Let stand until stuffing is softened, about 5 minutes. Fluff with a fork.
Spoon about 1/2 cup stuffing over each slice of turkey. Roll turkey around stuffing and arrange rolls in a microwave-safe dish, seam-side down. Pour gravy over rolls.
Heat in a microwave on high until gravy is bubbly, about 5 minutes.
