I found that drinking iced tea caused my blisters to be get worse. While the cold icy liquid helped with discomfort in the short term, the long term exposure to tannic acid (in the tea) was worse than the short term benefit.

It seems cold milk had the same effect.

Sadly cold water may be your best bet.

Tony, 69, non-smoker, aerobatics pilot, bridge player/teacher, avid dancer (ballroom, latin, swing, country)

09/13 SCC, HPV 16, tonsillectomy, T2N0.
11/13 start rads, no chemo
12/13 taste gone, dry mouth,
02/14 hair slowly returning
05/14 taste the same, dry sinuses, irrigation helps.
01/15 food taste about 60% returned, dry sinuses are worse in winter.
12/20 no more sinus problems, taste pretty good