My dentist recommended TheraMints which are sweetened with xylitol, which doesn't promote tooth decay. I carry and use these to this day (8 months since end of treatment) and they make it possible to be out and about without necessarily having to carry water. This is more applicable to life after treatment if you have the dry mouth problem.

http://www.3m.com/product/information/Dental-Xylitol-Theramints.html

PS - I don't know about the fruit version

47 yr old male non-smoker, social drinker, fit. Jan'10, Stg3 rt tonsil+rt neck SCC, HPV+, rad+chmo Vancouver Cda. 2yr clear Apr'12 London UK. Apr'13 mets recur to lymph btw left lung & aorta, 3x Cisplatin+5FUchemo+20 rad, was all clear but 6-mo PET-CT shows mets to pleura around left lung, participating in St 1 trial of GDC-0980. GDC lost effect and ended July'14, bad atrial fibrillation requiring hospitalisation, start more standard chemo 10 Sep 2014.
Sadly has passed away, notified Jan 2015.