I don't know about this <img src="/images/graemlins/confused.gif" alt="" /> The purist in me wants wine in a green glass bottle with a real cork and some fancy label with cherubs or halcyon rural scenes on it. After extracting the cork with a SAK and drinking the contents , one has a water container, reserve resource for knapping improvised tools, fishing float, tinder and writing implement. All this stuff is environmentally acceptable too, being recyclable and keeping several traditional crafts alive. As to your bladder container, it will need sterilisation and some form of stabliliser to keep the water from becoming compromised. <img src="/images/graemlins/grin.gif" alt="" />