Fresh lemons vs bottled lemon juice for MC?

Hello all, I am new here and new to the Master-Cleanse (ordered the book and waiting for delivery). I have a question I can't find in the archives. I know the recipe calls for fresh-squeezed lemon juice, but does anyone use the bottled juice with decent results? What are the advantages of fresh-squeezed lemon juice over the bottled lemon juice? Using the bottled seems so easy if the juice is the same... Thanks - I have learned so much from reading everyone's messages and am planning to start my own Master-Cleanse adventure!