The pocket tin is your minimum " don't leave home without it" kit. It has the bare essentials to get started, but certainly isn't sufficient for long term needs altogether.The condom will do, but yes, it's fragile. You would need to improvise a water container. So, whats out there? Native peoples made canteens out of animal guts, hollowed gourds and basketry. The artifacts of contemporary resourses are often present; glass and plastic bottles are all to common and waterways may carry them well beyond human traffic.Actually, a dedicated collapsable container isn't that bulky. Something similar to the military survival container ( it looks like a I qt. opaque plastic balloon) is easily stashed in a coat jacket.<br><br>