Ganga wrote:The big deal is the amount of air exposure... There are a few ways of minimizing this.
An alternative method is (as I often practice) to keep a collection of smaller empty bottles on hand (i.e. 50ml, 100ml, 200ml, etc.) into which you can transfer the remnants of larger bottles for 'safe-keeping'. This tact has two benefits:
1. Less ultimate air exposure over the mid to long-term.
2. The ability to assemble a 'library' of past purchases to which you can return later on.
Of course, some 'aeration' will occur during the transfer process. But this is basically equal to what would take place when pouring a dram from the original bottle.
As always, you need to ensure that the seals on the smaller bottles (whether cork or screwcap) aren't compromised.