Ugh! Heartburn already?!

Robyn
I remember having hellacious heartburn with my last pregnancy in the third tri but now, at only 16 weeks, it seems as if it's coming on strong already and here to stay.  I am already popping Tums but I even get it when I just drink water!  I am bigger because I have twins on board but not looking forward to this.  What do you ladies do to help combat heartburn?