I'm pretty sure KY isn't going to help as it is water based and will evaporate rather quickly.
I use the same goop that I use to lube the O-rings on my home water filter. It's a bit thicker/stickier than vaseline, but it is silicone-based. Regular vaseline is petroleum based and is probably a bad idea as well, as it may weaken your o-rings over time.
If you wanted to use personal lubricant, you might be better off with a silicone-based lube rather than water.