Drinking water can help you lose weight, whether you're restricting your calories or not. Consuming 2 cups of water before a meal helped a group of obese adults lose 2 pounds over a 12-week period without making any other changes to their usual intake, according to a 2015 clinical study published in Obesity.
How many tea bags should you use to make a half gallon of iced tea? One gallon is about 128 ounces, so if one tea bag is good for 10 oz  of water, then about 10 teabags is good for a gallon. Start with 10  and adjust accordingly with water.
How to make tea is a matter of personal taste. I use 4 family size tea bags to make 1 gallon. I do not let the water quite reach a rolling boil (just below 212 degrees) Let it steep until the temp is not to high to touch. I then add sugar an cool it in the fridge.