Ro system

is it ok to store RO water for weeks than feed it to plants as long as its being aerated and light proof.

It would depend on how much your going to get. And the biggest ? Would be how clean is the water from the store? Bacteria left behind can still grow. If I was you I would get enogh for this week and next. I know it's a pain but fresher the RO the better. How bad is your tap? You might not even need it. So test your water and then the stores. Don't just take there word for it.

I wouldnt store it too long and as long as you have it in a clean bottle or reservoir it should be fine. Your PPM is so low with R/O water its impossible for anything to live in there unless its already living in there like Warlock said.

Did you know the Pilgrims even kids drank beer on the Mayflower, water goes bad after so long.