Every time i drinking plain water cold or not i get sore throat. im not sick and if i add flavoring it dont hurt just with plain water it does.

You have the answer: You may add non-caloric flavoring. Try some fruit flavoring, eg. with slices of lemon, orange, strawberries etc, rather than chemical flavoring. For good health - Have a diet rich in fresh vegetables, fruits, whole grains, low fat milk and milk products, nuts, beans, legumes, lentils and small amounts of lean meats. Avoid saturated fats. Exercise at least 150 minutes/week and increase the intensity of exercise gradually. Do not use tobacco, alcohol, weed or street drugs in any form. Practice safe sex.