You should be able to pour it back in the bottle--I've poured liquid from Triton tanks (wait, are using Triton tanks or just a Triton battery?) into bottles with tiny openings. You just need to be careful, and you will lose a tiny bit of juice in the process. The coil head should just screw off (if a Triton tank that's is)--if you remove that first, it's a bit easier to pour the liquid back into the bottle.
On PG and VG, with the understanding that I'm definitely no chemist. PG is very thin (almost water-like)--it helps to carry flavor, but doesn't have much flavor itself; it helps with throat hit, too. VG is VERY thick and has a slightly sweet taste--VG helps produce vaper and can mute flavors. It sounds to me like you're getting a big hit of PG--throat hit, no vapor (what about flavor?).
By all means, if all else fails, go back to the store. Halo liquids have a great reputation for quality, but, yes, they are more expensive. You don't have to limit yourself to Halo juices, though--any juice should work (although be warned that citrus and cinnamon flavors can destroy plastic tanks).