The mechanics behind a gravy separator allows for the turkey juices to separate from fat (which accumulates at the top of the container) so that you can pour out the juice through the spout at the base of the container. A small watering can will do the same thing, because of the positioning of the spout. If your watering can's spout starts near the middle of the container, simply cover the top with plastic wrap and duct tape and then invert the watering can.
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