New Grower RO water

More clarity please. Be specific.
 
I buy my RO water at various kiosks around town for .25 a gal ... I keep it around for weeks at a time ...
 
More clarity please. Be specific.
it is reverse osmosis water if i am correct..(if im wrong im sorry still pretty new to this but learning along the way ).. im asking how long can you leave the tap water sitting out before changing it or making a new batch..
 
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