Prednisone & Dry Mouth

Prednisone - Last year I had to take prednisone 4 times in a space of 6 months, due to flare ups. I realized if I drank lots of water the side effects were non existent. As a result my sodium levels dropped. The doctor suggested that I drink some chicken stock with sodium each for a while. It worked. I have not had to take any predisone now for 252 days. Still drinking plenty of fluids including sports drink when active.
Dry Mouth - The doctor has told me that my dry mouth is a result of the Symbicort usage. Any suggestions other sucking on sugar free hard candies, drinking lots of fluids and gargling with biotene mouthwash 4 time a day?