I am thinking to get fresh water by Reverse Osmosis and store it in tank. Is there any study related water quality after long time storage?let's say one year.
Yes, it is possible to store water for a long time. The container in which you store your water will inevitably prolong or degrade the shelf life of your water. For example, plastic containers can infiltrate undesirable chemicals in water and quickly reduce their quality. To keep water for a long time it is better to have a tank where the air and the sun are not in contact with the water.