Possible Clues:

• Tonic drink
• Respiratory problem a normal one — all going back to drink
• Soft drink all pass round R&A twice keeps one up
• Soft drink flavoured with an aromatic root — alas I rap Lars (anag)
• Non-alcoholic drink
• After nasty virus, old man jumps into a stream, wanting a drink
• Nonalcoholic root drink
• Source of drink in Sark running short before stormy April, alas
• Drink prepared from roots