This seems like a version of Sims 2 Castaway! Oh, how I love that game. As for showers, I'm sorry to say, if you REALLY don't want one, you'll have to make all the sims inappropriate, although it sounds like you have WA, so you can get a bunch of Shower in a Cans, as well as some dry food and tents. I would take a short 3-day trip to China and get everything you need and then you're set to play!