Welcome...<br><br>What kind of container - like a milk jug? Those are the least desirable and durable containers, but would be OK for 6 month storage if you kept them out of the light and away from where they could pick up taints (petroleum by-products / fumes from the same - any solvent or fuel - VOCs in general). The type of plastic used for pop bottles, Ocean Spray Cranberry Juice, etc. is much better and has slightly more resistence to picking up taints thru the plastic. Tap water will safely keep for 6 months if you keep it out of the light. The shelf life of tap water can be extended (a lot), but not reliably in milk jug type plastic containers.<br><br>How much water are you figuring per day, out of curiosity? Unless you're on a slab on the ground floor, you should make sure you distribute the load. I can be more specific if that would help you.<br><br>Hope that helps.<br><br>Regards,<br><br>Scouter Tom