Carnitine - Buy 100ml saline or 500ml ? (sterility)

After you open a saline bottle its no longer sterile. I will need 130ml to a few vitamins im gonna try brewing. So even if i buy the 100ml
bottles it will still be left overs

Tought it would be best to buy 500ml and just freeze it down. that must be safe? but google write some bacteria survive

Should i inject micro amount benzyl alcohol in the 500ml bottle before i freeze it or is that overkill?

Better to buy 100ml bottles?
 
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