I have found that vodka nip bottles are great to make 50ml mixes.
After drinking a vodka nip I thought the bottle would be super handy. And considering how well vodka works as a cleaner for vaping devices, and also considering how vodka drops are sometimes added in ejuice, I knew there would be no contamination so to speak.
So I've been saving my bottles for free mixing containers
nips are 50ml so you can make a nice batch of your adv in a big bottle and transfer small amounts into your carry-out dropper bottle. A 50ml mix leaves a small air gap- enough to shake the mix 
After drinking a vodka nip I thought the bottle would be super handy. And considering how well vodka works as a cleaner for vaping devices, and also considering how vodka drops are sometimes added in ejuice, I knew there would be no contamination so to speak.
So I've been saving my bottles for free mixing containers
