A little late to the game, here, but I don't see the big Culligan (or similar) water jugs mentioned. They are around 5 gallons (I think - 18.5 liters), pre-treated, and quite sturdy. You can get hand pumps that go into the bottles, or get a gravity-fed dispenser (no electricity necessary). I don't recommend storing them on their side - about 1 in 20 springs a leak at the mouth - but they don't have a huge
footprint, and you can fit a few in the bottom of a closet. If you buy them before hurricane season, they will store fine through the season, and you can drink them and replace / refill them in the off season. We generally keep a few kicking around for power outages in the summer, as we are rural, and when the power goes out, our water pump doesn't work. We use rainwater for flushing and washing, to conserve the treated drinking water.