The only producer that I've heard of who strongly goes by liquid dubstep is Gemani (I don't know much about liquid dubstep producers though). In my opinion it really just sounds like chillstep with more trance elements - if you want to give it a shot I would learn chillstep styles first (seven lions, sound remedy, xilent, etc) and then add more textures and pads to it
To be honest, i used to drive to work every morning with pandora playing random dubstep songs, and i ended up on a few liquid dubstep tracks that led me to searching chillstep which began to change my taste in edm from then forth. all i listen to now is Liquid. its the best for long drives at night or winding down from the club.
idk whether it's liquid dubstep or 'chillstep', but I love it all!
very relaxing and the deep subbasses are beautiful with the full pad synths... vocals reverbed/delayed add a nice effect to that sound~
the drums give it a great rhythm too.
call it what you want, but i believe that melodic and trancey dubstep is on its way in. honestly, very few people are doing the "chillstep" genre service, and there's still a lot of potential to explore with the genre.