+1 for the idea of getting a 510 dripping atomizer. They're cheap and easy to clean to swap out juices. It's a great way to test out juices - just a few (4-5) drops gets you a clean, clear idea of the taste.
Some people go whole hog and set up an RDA (rebuildable dripper), but that's a greater investment and some amount of learning about rebuildable systems (a whole other topic). A disposable 510 dripper gets you 90% of that and it works out of the box.
After I've done the drip test to see if the juice has potential, I fill a cartomizer with it to carry around with me for a longer taste test. If I'm liking it, I then fill a tank of some sort. The cartos are disposable - saves me the hassle of cleaning a reusable tank if what felt good in the dripper turns out to suck in the longer taste test.
The 510 dripper should cost you about $6 and last you months. Cartos cost ~$1 (about the same cost of a coil unit in, say, a protank) if you buy in bulk and shop around.