I wouldn't put it in a plastic bottle!
Maybe it's just me, but I stored some glenmorangie in a plastic Nalgene bottle because the cork disintegrated.
After 1 week it started to taste like plastic whisky.
After a month it smelled like poisonous whisky.
I didn't drink it either time, spit it out.
The problem is that higher content alcohol leaches off the materials it comes into contact with. This is how aging works with the wood, only very slowly. This is also one reason why distilleries use copper tuns, tubing, columns, etc. as it leaches less than other metals and materials do. Of course it also doubles as acting as a good cooling surface area for condensation.
I would use a screw cap glass bottle from a cheap liquor.