I've had four cat scans in the past 3 months..and let me tell you..i HATE Barium..but, lucky for you, this is your first time...i promise, it won't be that bad!
Drink it cold...the warmer the harder to get down.
The Dr. tells you to drink one bottle two hours before and the other and hour before..I move it up a half hour so that if the appt. is at 2pm I start chugging at 12:30, finish one bottle, then at about 1:15 or so I would chug the second bottle..dragging it out for two hours is not fun.
And I would cancel the Dentist appt. because you will def. have to go #2 many times after the cat scan..and its really not pretty.
But my best advice is to chug it without even thinking about the taste or texture..its not exactly a five star meal!