I was treated for tonsil cancer 12 years ago. 6 weeks of radio and couple of sessions of chemo. Lost all my saliva glands which I had been previously made aware of. No problem until 7 years past then the trouble started. Without going into it too much, it turned out that the radiotherapy fried the top of my spine and has given me irreversible nerve damage. My eppiglotis and tongue are paralysed cus of nerve damage leaving me unable to ever eat or drink again. My mouth became very sore and a totally new level of uncomfortable life. Tried everything on the market. No good. Always asperating due to trying to moisten my mouth and fluids making it's way into lungs. I then came across a nasal douche bottle which aided me to squirt water into my mouth without losing it down my throat. Excellent. Problem is it's a tiny window of relief. So I purchased a small length of drinking water pipe, a hose to tap clamp, a reel of plumbers tape and made myself my own relief system. Using the lid and straw off the douche bottle inserted into the drinking water pipe and clamping it on the tap I now sit on the edge of the bath with my head over the sink and holding the douche top in my mouth I can happily enjoy the cold water flushing round my mouth for as long as I like. I havnt swallowed any water and not asperated once in the 3 months I've been using it. Unless you know how it feels to be burdened with these problems only you can imagine how much relief this can bring. I'm pretty sure this could be simplified but for now it's made a big difference in my life.