Imho It’s dependent on what you are storing it in
Glass is best
Potable water Container next
Most plastics leach phthalates
phthalates help make plastic flexible and durable
They are harmful to the endocrine system, with potential subsequent organ failure, the levels required to cause this are high, phthalates also break down fairly quickly, so drinking from plastic containers is extremely unlikely to be a problem to us human's, however I think it’s worth bearing in mind when storing water for our fish
Personally I don’t use cling film to wrap food, perhaps I am being over cautious
I use an old aquarium to store RO water