In reply to Stuart Williams:
I did just mean it as a cheap, ultralight, collapsible bottle which was of known volume to dilute the tablets. sorry that wasn't clear. Also obviously invaluable to carry any water where conditions are likely.....I think there's a very a recent UKC thread where many replies recommended coke type bottles over bladders and nalgene.
Edit. In case anyone hasn't used sterilizing tablets before one needs to leave them acting for some time to kill microrganisms, so obviously one needs to carry the water in some sort of container before use. Being a dork I forgot this once and burnt my mouth.
Post edited at 12:07