Long water storage whith starsan

I have unlimited access to 20lt cubes. I was wondering if rinsing then with star San prior to filling with water to store long term would be viable? The containers are all food grade just wondering if from a survivalist viewpoint if this would work.

If the water was boiled, or otherwise purified, it would be fine for a period of time. The Starsan would sanitize the container, but not the water. The container would be sanitary, but once filled with water the solution from the residual Starsan would be so dilute that it would be useless.

If you check out survival water you'll find that it has an expiration date. this would lead me to believe that unless it was sterile, the water quality would deteriorate to a point that it could be undrinkable.

Bob