Future Spacecraft Could Protect Crews With Walls Made of Water
http://www.popsci.com/technology/article/2012-09/future-spacecraft-could-protect-crews-walls-made-water
Radiation shields, new engines mandatory for Mars
http://www.spaceflightnow.com/mars/msl/130530rad/#.U3wEwyhr2og
Thanks for the links. I figured years ago that water was the most economical multi-purpose material for the job. I am still interested in how they go about it.