The review that I wrote about the Woodlore Course is up in the review area. Have a look there.
I enjoyed the course. It was really good at going through the basics. The only down side is the length of time to wait between booking the course and going on it. They sell out early. Some people do drop out so places do become available.
Anyway, in the time between my booking a place and attending the course I made an effort and read Ray's Survival Handbook and Bushcraft books several times...err...ok...probably about 6-7 times each. I guess that it was useful, but it did lessen some of the magic of discovery on the actual course.
That moss and charcoal filter is great....if you have a cola bottle, some charcoal, some nice moss, plenty of time on your hands and you have lost your real filter. Like so many bushcrafty solutions it is more of a last ditch wilderness living solution than a traveling/camping light solution. A Millbank will do the same thing without so much hassle.
I have just got a ceramic water filter. In theory that will take the place of boiling, which can be less than convenient at times.
Edited: It does not take the place of boiling as it won't kill viruses, however there are many places in both the USA and Europe where virus contamination is not considered a high risk. Filters will remove bateria, cysts, protozoa and some will remove chemicals too but without the chemical back up you have to be careful. Sorry that I mispoke a little. Given that you can get through 3-4 litres a day without much difficulty, boiling in a 1l billy can be a real pain, especially as the water needs to cool a bit before you can put in a plastic canteen!