Why don't you try to go raw for a week? You could still eat with your family and also prepare for fasting. If you decide to do the store juices, make sure that they're as natural as possible - not made from concentrate for sure. Check the Bolthouse Farm and other juices in the refrigerated section in your store.
I didn't notice anything special about the day 4. For me the most difficult thing is to get over these first couple of days. If I get over this, I don't even crave any chocolate or icecream or pizza or other "bad food" any more and it goes pretty smoothly. You also start to see some results and this might be a huge motivator.