Help Storing an opened SN bottle

[BringMeToLife]

I ordered two bottles of SN - one for testing, one for an attempt. Is it safe to keep an opened bottle in a closet, behind clothes? I don't live alone and have pets. I want to do the test as soon as I receive my order (I'm inpatient and curious), but I won't make an attempt before I don't use my last chance for getting better. That means the bottle would be there for at least a few months.