I know that Hot Tub/Spa water is an issue/concern for many of us. I use the water from my Hot Tub to water my landscape as it is technically considered graywater/greywater whenever I empty it.
I also have issues with chlorine, it's harsh on my skin and aggravates my asthma so I chlorinate mostly right after I've used the Tub. I've been looking for alternate ways to sanitize the water and ways to neutralize chlorine and found these sites:
http://www.rhtubs.com/cgi-bin/bbs/co...mes;read=70390
http://www.exit15.com/vitabath-effer...ts-p-1307.html
http://www.rhtubs.com/chemical-free-index.htm
NOTE: Vitamin C (Ascorbic Acid) powder can be substituted for tablets and is cheaper.
As to setting up ways to use the waste water from the laundry, shower and sink there are a number of products available.
You can't use waste water from the kitchen sink because it contains food particles and grease unless you filter it extensively but here is an option that makes sense, as unattractive as it may be, lol.
www.envirosink.com
This one recycles waste water from the bathroom sink to flush the toilet. I like really this.
http://www.aridsolutionsinc.com/page/page/522317.htm
I particularly like this system and plan to use it for the shower and washer waste water when we buy our house in TV.
http://www.greywater.com/index.htm