I'm 9 days into covid19, my chest sounds watery and i'm coughing i'm also suffering from shortness of breath. is there anything i can get from the chemist or do i need to see a doctor?

Chest water : I would suggest that you call a doctor ahead of time to let them know you are coming, but it seems best that you go to the emergency room

COVID 19: If you have difficulty breathing recommend emergency room evaluation. Get emergency care for difficulty breathing, blue lips or face, significant & persistent chest pain or new-onset of confusion.