I know, I know. You can't wait to get on board and get to all those great destinations, and go on those excursions. They'll have everything you need right ? Wrong !!!!!     Some / many of the places you will visit may not have running water.  That's ok, you grabbed a bottle as you got off the ship. Good thinking.    But what about facilities ?  Believe me.   In some of the places you visit, an old fashioned outhouse would be a blessing.   So, what to do ?  Well, the wife and I, ok, it was all my idea, started packing something called a  Biffy Bag  a few years ago.  Available on Amazon, bring a few.  You can thank me later.