Okay, I'm not on the Master-Cleanse now...but I've done it twice with b&p's since November. They were fantastic! First one was 9 days (finished with a liver flush) and the 2nd was a 6-day-er.
It's totally up to you. There is a point where you transcend the food thing...it's quite nifty. You might want to experience that! But, maybe not...whatever is right for you...yes yes yes, you can still get out stuff and eat salads. My boyfriend didn't fast and he got out his penny. It DOES come out.
I can understand your feelings about saving your dad...but who knows what would have happened....? Just keep loving him...that's the most important thing...