One day will do some damage to the worms- three is the best. Why cant he do it while also at work? All he needs to do is bring cut up pineapple and pumpkin seeds in his lunch container. -- and a thermos of water. They say that you dont go hungry on this fast- The sugars in the pineapple keep the blood Sugar up.-- the fat in the pumpkin seed helps too- and it also has the effect of paralyzing the worms so the bromelian can kill them off easier.
Distilled water they reccomend, because it is more pure of toxins than other waters. Except the store bought variety though.-- you have to distill your own.
I dont think it would hurt if you got normal spring water and used one of those Brita Water pitchers to filter out any thing.
I think the pineapple fast still will be effective.
I know it will be worth it for him if he does it for three days.