GaviLyte-C
"It's a lot to drink but you can do it.  I used a straw and just chugged it down.  I did use the lemon flavoring packet.  It really didn't taste too bad.  My suggestion is that when you first feel an urge to go.....Go!  This stuff works.  My doctor had me take 8 oz every 30 minutes, after the first two doses it started work.  I spent the rest of the day on or near the toilet.  An hour after my last dose, I was done.  I did not have any cramping, nausea or vomiting.  Overall, not a pleasant experience, but this liquid is not too bad."