I have become allergic to something in our tap water giving me mouth sores, mostly on the tip of my tongue, and have resorted to drinking bottled spring water. I no longer have the sores but it is inconvenient having to carry water to work and everywhere else I go. I currently have a red, itchy rash on my neck, ears, cheeks and eyebrow area. I am still trying to determine what is causing it. I have not previously had many allergy issues.