I use nitrile gloves and recommend them over cheaper alternatives. They have better grip of what you're holding onto, nice and rubbery, and hands get sweaty/slippery inside them much less easily than with, say, vinyl, or even with regular latex. Plus, it's not like you're going to be stirring it with your finger, just grasping the bottles. If you're so inclined, pull them off gently by the fingers and reuse them a few times before chucking.