Exactly the same as the vapor storeJust make sure it's USP!
The issue is nic liquid actually degrades to a certain extent, you will see it gets darker.
A reasonable amount on hand is good enough IMO.
Air is nic juices enemy So store it in smaller glass containers full to the top(no air space) in the freezer.
I bought balsamic vinegar dark bottles at Walmart in 250 ml size washed then out good & put my nic in them in freezer
At the moment I have 2 L of 100 mg that I'm breaking down and 4 ounce bottles glass and throw it in the freezer probably going to get one more for 3 L I vape at 3 mg
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