I have my black book of answers, it says: low carb yogurt, skim milk, water, crystal light or similiar, decaf tea, sugar free gelatin, broth (low sodium), sugar free popsicles, vitamin 10 water, vitamin zero water, propel...
NO caffeine coffee or tea, carbonated drinks, or alcohol
oh and protein shakes... I used premade low carb slim fast...but you can go to InsureNutrition.com and fill out the form to get free protein drinks, etc... you will need them afterwards as well
