Keith
In LONDON I was given a Nebulizer on the NHS it often is used for athsma it vapourises A sodium chloride amputet, it improved my mucus 300% it is better than mouth wash and pain killers, good luck.I stick to water and take food through PEG any food in mouth just coats tongue and turns rancid.I will try the seltzer tip.
I too have a couple of weeks of radiation left and I am focusing on the future all this being worth it.
Touch wood, fingers crossed, and god bless anyone having this treatment.

21st March squall cells.Endescopy not oesophagus, ENT .April endo nose CAT MRI general Panendoscopy prim-HPV 16 base of left tongue one node-stage 2.23rd of May.14/5/12 9 teeth out.8/6/12 PICC inserted.11/6/12 1st Chemos 25/6/12 2nd Chemo Cisplatin5FU:27/6/12 PEG23/8/12 Radiation finished 1/9/12.