Resevoir Size for RO Water Storage?

Was wondering how big of a tank everyone uses to catch the water from their reverse osmosis.

Also how long does the RO water last? Does it ever go bad? Also do you keep a lid on your container or let it breathe?

Thanks LBG

r/o water does not go bad. You don't have to let it breathe. I put a lid on the water bottle, but that's it. I save the runoff after I have captured the r/o and use that to water my plants. I drink the r/o water and fill 1 gallon water bottles to bring inside the house.