BPA gives you Cancer
Aluminium gives you Altzimer's
Stainless Steel reacts with purification tablets
Chlorine destroys your GI tract
Iodine gives you thyroid disease
Water makes your teeth fall out
Or so 'they' sayAll these are
Risks, but then so is smoking, drinking, driving, being within 1600 yards of a gun, using a mobile or leaving your house ( for that matter, staying in your house). Manage your risks as you see fit [/troll impression]
@Gareth (or anyone whos interested). With SIGG bottles (or any other screw-thread top) rotate the top backwards until you feel it click, then both thread ends will be lined up and you're so much less likely to cross-thread
@BPJ, I used to have a knock-off ali canteen when I was a teen, it got left dirty (I didn't know any better ) and stank when I found it. Denture cleaning tablets fixed that problem (the leaking seam was another matter, and the reason I stopped using it..... By giving it to my younger brother

) so smells shouldn't be a problem...... I've never boiled in a water-bottle as I nearly always have a pot or a fire-safe mug