Just wondering: How long can sterilized water (BAC) be stored after opening?

[Newbie just started playing]

I bought a large 30ml bottle, which seems like it will last a long time. Will it expire?

 

[Hardcore experimenter]

The official lifespan is 28 days, but I've kept it in the refrigerator for two or three months and it's still working fine.

 

[Formula Master]

As long as you follow aseptic techniques when pumping water and avoid contamination, it will be fine.