Let me know if you find a food-safe one. I've considered doing the same thing with a precision oiler. In the meantime, a big syringe with a blunt needle (get them as medicine applicators from farm stores like Co-op) works well for me--they're cheap and I already have a few on-hand for filling fountain pens.
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Titan 15200 Precision Oiler
Current $8.80
High $9.99
Low $7.25
I'm not sure those would be good material to store juice in since they're aluminum. Very cool though. Innokin makes this.
http://www.vaporalley.com/uCan-Innokin_p_412.html
I would think plastic or stainless steel would be the only suitable ones, maybe copper. I can't remember the name of these things so it is hard finding a source, if there is one. I thought if I got a few of these, it would be novelty but at the same time might be nice for ease of use. I have been making juice for friends and thought they would get a kick out of something like this. It would be more for home use where you can sit it on your desk.
Have you ever used one of these? When you press on the bottom it sorta pops and an uncontrollable amount of juice would come out. You would get the same size drips, every time. And they would be big. Also, the bottom has to be rigid.
I know it's mean't for oil, but high VG juice can have the same viscosity I think. If I can find one in stainless or even if someone is making a plastic one, I would try. It seems like it would be a great container to put my juice in. Not really for walking around but for by the couch or at the desk.