What taste alternatives can be used in stead of Citric Acid? I just started Protocall 1000 but having issue with taste I am on day 4

I am on day 4 of Protocall 1000 MMS. What alternatives can be used in place of citric acid. Can Lemon Juice be used or something else. If so do I do the procedure of 3 drops of let's say Lemon Juice or what ever you are going to suggest. I sincerely appreciate any advice or info. Thank you in advance. Terry