It’s summertime! Cool down and refresh yourself with a glass of homemade O.J. According to the USDA National Nutrient Database for Standard Reference, a glass of orange juice made with one orange gives you the US RDA (recommended daily allowance, which is 70 grams) of Vitamin C, along with other essential vitamins and minerals like calcium, potassium, and Vitamin A. Here are some fun ways to make orange juice at home, and involve the kids too!