Can I put lemon in my water? 20 February 2023 16:47 Updated Although we suggest no additions to the programme, up to 1 wedge of lemon per day is allowed. Related articles Can I chew gum during ProLon®? What if food outside of the ProLon® program were eaten during a day of the diet because of circumstances (e.g., social event)? Is there a "transition day" diet after completing five days of ProLon®? Is tea, coffee or infusion allowed during ProLon? Can I add herbs, spices or salt to the soups?