ok, so I misspoke about sealing soup, it's just something that I probably wouldn't do, I guess I'm not the same as others.
The question wasn't really about your soup or vodka, but rather why a chamber versus sucking one end out. I know with my vacmaster (or whatever the name is), if I try to cycle it too fast, the pump heats up and goes through the little lightbar dance, but doesn't vacuum out all the air as well, and yes you need to pay attention to liquid coming out the end being sealed. In the past I've helped mitigate that with a strip of paper towel across the inside of the bag, which traps liquid as it moves up towards the seal. Then again, I had a bunch of fish from an Alaska lodge trip, and probably 7 out of 10 bags lost their seals, and they were using a chamber vac. That made me wonder if they were really any better.