I just increased my redundant water containers also. My main carrier is a 5qt. G.I. unit with two 1 qt. saddle canteens. My rucksacks contents are roughly segregated into various poly bags and one is carried in a pocket. I just acquired some of the water retort bags from Mainstay. I didn't think highly of the concept until yesterday. I was in a huge mall when a massive headache struck. I had my aspirin in the PSK. Ever try to find a drinking fountain or restroom in these places? I now have a few slipped into various pockets. Is it much? No, but if I had to take a med or literally "wet my whistle" to signal for help it's there. Another strategy, sadly impacted by irresponsible people, is to cache water and a few basics. This was an old courtesy in many regions. I had a 5 gallon container plainly marked for an archaeological project where walking in to one site was arduous. It walked back out with some visitors who emptied it. I caught them at the cattle gate!