I have read about charcoal being used to clean water before it is then boiled or mixed with a UV light stick. I have some questions about this:
1) Does it have to be activated charcoal?
2) Can I use normal charcoal from any old shop (in the UK) as I assume these days everything is synthetic or have added harmful chemicals?
3) Can it purify irradiated water? Yes I am a huge Fallout 3 fan!
If there is anything else that I might not have thought of asking, or might be interesting, feel free to let me know :-).