Is it safe to drink Three Legs Cooling Water on 36wk?

I'm currently 36w pregnant and having bad cough for more than 3wks now. I got meds from GP during the 1st wk but I didnt get well at all. I also had meds from my gynae which didnt really cure me. She told me I just had to keep hydrated and take vit C as meds for pregnant women are not really that strong. I've also tried all other home remedies. ?