Buy a can of coconut cream. Trader Joe’s sells it in small cans by the coconut milk, and so do some other supermarkets.
Buy a can of full-fat (not lite! This will not work with lite!) coconut milk and refrigerate it. After a day, take it out, turn it upside-down, and open it. Pour out the water at the top. The thick white stuff left at the bottom is the cream.