My severely handicapped daughter has just begun to take Miralax for chronic constipation. She is fed a liquid diet through a G-tube. Should Miralax only be given with water or juice, or can it be mixed with the liquid food (formula)? The directions say water or juice - I'm concerned that giving it with formula may give her cramps/gas. She does not speak, so I need to hear it from someone who has actually taken the Miralax with food or other than with water.