The unsweetened iced tea at McDonald's contains zero grams of
fat, carbs, and protein. It is, after all, nearly totally water.
The small (16-oz.) size contains about 10 mg of sodium. Sixteen
ounces of water is nearly half a liter (473 ml). Since one
milliliter of water weighs one gram, we can say that a small iced
tea weighs about 473 grams.