Sometimes the SWF is difficult at first. Things that can help:
Brush your teeth immediately before drinking it. (Some people swear by this.)
Use Celtic sea salt (this is probably the biggest factor for making the SWF palatable).
Drink it as hot as you can stand it and pretend it's soup. (Or, conversely, some people like it cold.)
Drink it through a straw so it goes down faster and you don't taste it as much.
Drink it from a pretty glass, take your time, and pretend it's champagne.
But however you can, do try your best to get it down, because it's a really important and extremely useful part of the cleanse.