I've purchased bottles for my diy from 2 different places with the same result - you have to squeeze the bottle *really* hard to get any juice to drip out. Filling a mini nova is a real chore. All of the juices I've purchased come in bottles that drip fine. What am I missing? I've been cutting the tips off but find that annoying because e-liquid leaks into the cap. Is there a better technique or a better source for bottles?