Take an equal amount of hair oil and shikakai powder. Add little reetha powder to the mixture. You can use hair oil, reetha and shikakai in solid form also.
Answer Wiki. The short answer is eight -- there are eight U.S. pints in a U.S. gallon, and eight British pints in a British (or Imperial) gallon, which covers any realistic situation this might come up in.
One pint is 2 cups, thus 16 ounces. A gallon is 4 quarts, or 8 pints, or 16 cups = 128 ounces. *This assumes American measurements, and fluid ounces, not weight (I'm not sure if the U.K. even uses cups through gallons, or if everything is metric over there.