If you are doing a fast for weight loss, you will be only able to consume beverages that do not contain any carbs. Depending on how strict you want the fast to be, you may also be able to consume drinks that have very low calories but no carbohydrates. Some beverages that are consumed by people during a fasting period are apple cider vinegar, warm lemon water, black coffee, and carbonated plain water. You should avoid sports drinks, white tea, fruit juices, vegetable juice, and a cup of coffee with milk or sugar added.