Quick question

Ok so, I've been looking around for the answer to my question but I haven't been able to find a direct answer.. If I mix a bottle of nutrients up (not one in general, just the synthetic kind.. Non organic? Ok let's use gh for an example) and store it or not use it or introduce it to plants for a long time, will it still contain the same properties as when I mixed it up fresh? I've seen some pre mixed nutrients for sale at the hydo shop, so I've began to question my theory (they would eventually go bad) and am uncertain.. I'm not worried about not doing it right or am un experienced.. Just kind of curious! If I were to mix them up in a plastic bottle and throw a lid on it and throw it in the basement for a week, month, or a couple years, would it be ok to use? Any insight would be cool to hear..

No one knows?

Adding straight water wont really affect the composition or shelf life of a product. It would only dilute it.

If you are using water with high mineral content or adding a second fertilizer, you run the risk of having chemical interactions and precipitation.

Ok well let's say for instance that it's just general hydropinics 3 step (veg, bloom, and micros) and I dilute it with ro water with practically no EC and throw it in a thoroughly cleaned out plastic bottle and seal it with a lid. Would this be ok to use like say, a month later?