The discussion was in another thread, not specifically related, which is why I did a copy and paste

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The above base is VG only, so the saline hydrates while the DW thins things out a bit since VG is so thick. Anything at or near 100% VG w/o a diluting agent is going to have a hard time wicking in most tanks, cartos etc, so that's why it's in there (not the only reason, but it's part of it).
If you're going to do a PG/VG base, then you'll need to reformulate the base to your liking. PG carries flavor better, VG produces more vapor so for me personally, I use a mix. I keep it close to 50/50 and I use about the same type of base. Mine consists of:
1% PGA
9% Saline (.9%)
40% PG
50% VG
I have used flavored Vodka in place of PGA, but only when I am 100% sure it's sugar-free in terms of no sugar added to the final product. For that, I recommend Absolut. In some places PGA cannot be sold (more so overseas, but some stores in the US don't sell it either). I do not use DW because the PG is less viscous than VG so it thins everything out for me as does the saline and PGA/Vodka.