DON'T keep in the fridge, too cold can cause the juice to thicken up and will lose its flavor...you can keep unflavored juice or nic-only juice in the fridge but that's it. And when you leave the caps off its considered "oxidizing", not steeping. "Steeping" is just letting your flavors "meld" together if you will and just giving them time with a good shake a couple times a day to add oxygen bubbles and mix up the flavors so they can continue "steeping" if you will. Over time, and not too long either, the flavoring and nicotine falls to the bottom and needs to be mixed back up, that's why most people give it a shake or a swirl before they use the juice....let the rant begin! Lol (though I hope not)