On the topic of water and filtration:
Has anyone seen this product yet?
http://www.lifesaversystems.com/index.html
a very good presentation on the product can be viewed here:
http://www.ted.com/talks/michael_pri...er_filter.html
Seems like a very practical product to me for drinking water, although I can't see a substitute for knowledge of filtration systems in case of a system failure...
After all, we are discussing being prepared.