Russtang writes in with a super-cheap water purification straw… – “Just saw this at my local HarborFreight. Says it removes pathogens as small as 2 microns and treats up to 20 gallons. On sale for $8 – FRONTIER(TM) WATER PURIFICATION STRAW – Ideal for hiking, camping, travel in foreign countries, and emergency use. Removes pathogens as small as 2 microns, including Giardia, Cryptosporidium and E. Coli bacteria, Activated carbon filter removes chemicals and improves taste, Super compact, fits in a pocket, Treats up to 20 gallons of water.” – Link.
Jon also reminded me about the life straw – Link.