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Low flow shower heads are going to be the way to go, you can get some really nice 1.5 gpm shower heads (2.5 gpm is standard) you can even get down as far as .5 gpm but those shower heads need higher water temp as the fine stream of water cools quickly.
You can also get sink aerators that reduce the water flow while adding air to it to make it look like more water, personally I brush my teeth with a small glass of water that I fill and plug the drain while washing hands, washing dish's in the largest dirty pan or with the sink drain closed as well.
self closing sink drains would really be the way to go.
If you really want to drop the water pressure you can get pressure regulators that go on the water main, but using the proper low flow fixture is going to keep your room mates happier.
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