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.
Lipton iced teas contain caffeine, but the amount varies based on the flavor of tea. On average, Lipton iced teas contain just under 20 milligrams of caffeine per serving, though most types of the tea are sold in 16- or 20-ounce bottles, making them around two servings per bottle.