I've talked to my Dad about setting up something to save rainwater, but it would only be for outdoor use. We've tried to figure out a way to attach our groundwater pump to some of our indoor appliances, but it would never work with the setup we have now. For now, though, I just put all my empty buckets out in the open when it is raining and catch as much as possible. Then I put it in one of my food-safe buckets and use it for the plants that can't be moved from the patio.
I'm tempted to set up an outdoor area just for doing laundry, though. Sure, it would be hard work to use the pump water and hand-wash clothes, but it would certainly be less expensive than using the washer. There are 6 people living in this house currently and the washer is running all weekend and some days throughout the week. Plus, I'd be able to hang up more of our clothes outdoors to dry. It's kind of wonderful seeing clothes hanging outdoors, being blown dry by the wind and sun. It makes me giddy, hehe!