Lost Voice

drinking warm water mixed with honey does help. you should also avoid eating oily foods. if all else fails, eat some lozenges, or stepsils :) also, i heard from a friend that to reduce the chances of getting a sore throat, you should speak normally, not shout, and not whisper at all. yes, he told me whispering is bad for your throat

Most importantly don't try to talk or you'll strain your vocal chords. You need to keep your throat moist and soothed so try drinking warm (not hot) tea with honey or anything that is not acidic. It will take time so be patient.