What can i drink to improve my singing?

I know that some artist drink "the breakfast of champions" (as usher calls it) so is there anything i can drink to improve my singing? include recipes with easy and cheap ingredients (im lactose intolerant so no dairy) and dnt say vocal exercises cuz i already do them with the whole 112112321.... and do re mi so yeah help! i have until july 30th to master the song "ill always remember you" by hannah montana