What is the L-Drink for and what is it made of? 20 February 2023 16:50 Updated The L-Drink contains purified water, vegetable glycerine, and natural flavours, and it is intended to support hydration. Related articles How do you prepare the L-Drink? Can I drink sparkling water or distilled water? How can people of different sizes and weight eat the same things with the same amount of calories while on the program? Can I add herbs, spices or salt to the soups? How much water should I drink during ProLon® 5-day?