Someone asked what the point of the rosehips were - they're packed full of Vitamin C.
I'm just emerging from 18 months or so with a croaky voice, which seems to have been caused by my asthma inhaler. Another asthma treatment (Singulair) seems to be clearing it up. But in the meanwhile was referred for voice therapy (and have had four out of six sessions) which have just made me incredibly self conscious about whether or not I'm relaxed, rather than helping with the croaky voice. No worse way to get someone to relax than to keep asking if they're relaxed, in my experience!
As to foods ... water, water, water, water, water. And water.

Anne