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.
According to the Australian Government agency Australian Broadcasting Commission; http://www.abc.net.au/quantum/po... 1  A standard 250ml cup of tea (iced or hot) contains about 27 mg of caffeine; (varies from 8 to 91 mg) 2  A 375ml can of Coke contains a fixed amount of 38mg of caffeine. So, doing the comparison math on a standard 285ml (US 9.6 fl.oz) glass of home iced tea and Coke then: A 285ml glass of iced tea = 30.8mg of caffeine on average, but could be as high as 103 depending on the tea variety and brew time. A 285ml glass of coke = 28.9mg of caffeine.