I have the same issue. I have been eating alot of frozen fruit bars, popsicles and watermelon.
I ate a lot of fudgesicles and popsicles on treatment that much I can tell you, I even brought them in to work.
It does wreck havoc on your teeth as does the interferon.
Hi I also have the problem with dry mouth. I drink lots of water and I use something called Hall's Refresh (moisturizer lozenge) for dry mouth, it was in the cold aisle at Walmart. Also Biotene makes a spray and gum for dry mouth.
I am alternating with sugar free candy, it is miserable, I can sympathize.
All of the above does help, the Halls is the best
Good luck
Dorene