I use my kuerig set to 189°, a narrow coffee mug and "brew" a tea cup 6oz of hot water, with out a K-Cup in the machine... thats just me though!
I know this comment is 5 months old, but I've got a Keurig and I'm curious now. Do you just drop the bottle in there, let it sit, and take it out when the water cools off?
I run a the keurig with out a k-cup in basket as a small cup and place the bottle in said mug use a large diameter mug so the water is just deep enough to not kettle bottle float and place the bottle in with out the cap and wait for water to cool replace cap shake the shit out of it poor the water out with the cap on make a large cup of hot water and allow the bottle to float let water cool and hot steep has been performed!
Heat steeping makes a world of difference to your juice - you can use your old ashtrays to improve your vape!