I've had this question a few times now, what lighting equipment do I use?  Some ask about my  big set up, do I use couple alien bees, softbox, etc... but honestly I actually just use one light when I'm out doing my sunset shot.  Most times one, sometimes 2 speedlites.  In the beginning, when I didn't know lights, I got the alien bees set up, but I don't ever use it.  It's not very mobile, big to carry around and I'd need a battery pack.... HEAVY!  I tried it once, I was exhausted...really.  I was also worried about the wind knocking it over.

-Canon Speedlite 580exii

-Light filter, I use the photoflex blow up softbox

-Scott Robert Lim's trigger system, one on hotshoe of your camera, one on flash

-One light stand

I usually have my lightstand 3-5 feet away from the subject.  I don't use an umbrella or huge softbox because it's windy here, which can cause some damage to your lighting gear.  It could work if you bring sand bags, though I can just see the umbrella blowing inside out.

Its my easiest setup.  Ofcourse I can add more if I wanted to, but on location I like to bring just 1.  If you don't have a lightstand, bring an assistant.  Or you can shoot & hold it yourself....up and to the side....it might work ;)