You need to consider a few things, 1 A person needs around 1lt of water per day, (depending on the age, size, weight) to remain hydrated, and functioning normally. 2 also consider your actively levels and environment (if your living in area's with high humidity conditions you may need more) So with that taken into consideration, if you had 1lt of water for each day, 365 Lts would be more that sufficient in my opinion! I hope this has helped you with your planning!? Stay safe mate.

1 of per day would suffice if you were inactive in a cool environment. However in a survival situation or in the event of society breaking down you will no doubt have to be active in your endeavours to endure, add to that the Australian climate and the necessity of having some back up you should allow at least 4 lts per person per day. Also you will need water for rehydrating freeze dried food

In the army on exercise we worked on 20 litres per man per day. That was for drinking, cooking and basic hygiene (cleaning teeth and maybe a wet towel wash; not showering). In East Timor we drank up to 9 litres a day in the summer! Your needs may vary. So consider your basic hydration needs. If you wish to store water consider the risk of contamination if using recycled storage containers. At home I have generic brand bottled water and I rotate stock so it's never too 'stale'.