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.
The general rule of thumb is one tea bag per cup, or eight ounces, of tea; however the type of tea you use and how you brew it may require more or less. Experiment with the different methods of brewing iced tea using the initial recommended number of tea bags then add or remove a bag based on your taste preferences.