These are good points for liquids in helping the voice. I use these ingredients (honey, lemon, ginger) in liquids. When it comes to foods, garlic and protein especially eggs (as they are low density) are also beneficial to the voice. I used to preach that alcohol in moderation is helpful as it is a relaxant as mentioned above. I have only had a couple of drinks in the last month or so, and I noticed that my voice isn't as strong as I was dependent on the alcohol. I noticed that if I had three or four beer in the evening before bed, the next morning, my voice was fantastic. I loved to drink Holsten Dark Beer (7 %) which is a German beer, and Grant Family Reserve Scotch Whisky, and I was also known to drink Faxe a 10% Danish beer.