Yes, you can use aluminum foil to make a fish grill basket. To do this, take a large piece of aluminum foil and fold it in half. Create a rectangular shape by folding the sides up, leaving enough space in the center for the fish. Fold the edges over to reinforce the structure and prevent the fish from falling through. Optionally, you can create a handle by folding one side of the foil over the other to form a loop. Place the fish in the center and season as desired. Fold the foil over the fish, sealing the edges well to create an airtight pouch. Grill the foil packet on medium heat until the fish is cooked through.