Harplayr is right, it is simply letting them sit in a cool dark place. When I was new, that made me think the fridge was the best thing, but no, I did one in the fridge and one out, and the one in a cool, not cold place was best. If you have let them sit that long with the cap off, you will probably find that the alcohol taste is much more mild. It does not ruin the juices, but you will just reduce the long term potential of them. I thought butterscotch had a strong strong alcohol taste, so I let one sit with the cap off, and one sit with the cap on. With the cap off, the alcohol taste was reduced, within two days. The one with the cap on was basically the same after two days. Next, I let them both sit with the cap on for one month, in a cool dark place. The one that had the cap off originally, steeped in a different way. The flavors did not meld together as well, I could taste, BUTTER, then the other flavors. The individual components did mature, but they did not mate with each other as well, but it was still good. The one that had the cap on the whole time, was butterscotch flavor all mixed together. The flavors had blended seamlessly. Also, the juice got a lot darker than the one with less alcohol. With banana split, the same thing happened. With the cap on, the juice got very red, the cherry developed in a big way, but with the cap off, it was vapeable sooner, but over time, nothing special really happened. Alcohol blending is used in many things, from liquor to making food flavorings. To put it simply, think of two pieces of caramel candy as molecules of flavor in your juice. If you let those two pieces of candy sit in water for a month, the water would taste like caramel. If, however, you let those pieces of candy sit in alcohol, you would get something that tasted more blended, stronger, and smoother. You steep so you flavors can mix together, and become smooth yet strong. After steeping for two weeks to a month, you can then leave the cap off for a day or two if the alcohol is still too strong, because it has already done most of what it is supposed to. Personally, I take the juice out right when I get it, and put it in brown glass dropper bottles. The brown glass blocks most of the UV rays, so you don't need to worry about light as much, and it also doesn't off gas. Plastic off gases chemicals. Plastics today are better than ever, but it still has an effect. I make my own mustard, and if I store it in glass and some in plastic, the mustard stored in the plastic slides off of the knife when I scope it, leaving nothing on the knife. But the mustard stored in glass, sticks to the knife, that tells me the plastics are off gassing. Given enough time, plastics will go back to their original form, a gas. If I have no banana's foster, and I buy new, I may sometimes let twenty ml of juice sit for a day with the cap off, but I will let the rest steep. You didn't ruin your juice, I would vape it, and get some more of what you like, put it in brown glass, and let it steep. Feel free to email if ever you have questions, if the thread allows me to post my email. XtianApi "at" "comcast.net"
Good luck.
yeah, and the caps even fit on some kinds of 30ml bottles too when they have the small thread openings 
