How to store RO water and keep it fresh for a month?

What are you worried about growing in the water ???
Can you explain your question, please?

I'm worried about bad bacteria growing in the water.

I don't want to water my plants with water that is contaminated by harmful bacteria.
 
My uv filter is sized for the pond size it's meant to filter. An airtight container with a single dose of chlorine to 1-2ppm free chlorine will work too.
 
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