Jean Kerr once wrote, "Don't hire known alcoholics. The unknown ones will give you trouble enough." There has to be a collateral rule about drinking real liquor on the set. Don't do it. Not cool for you or the other actors. If the actors get "sick" drinking weak tea then switch to apple juice.
Back to food: the most versatile piece of food used is a banana. It can be fried, mashed, reshaped, dyed and changed into damn near anything. If it reads like a chicken breast across the footlights, who cares that it said Chiquita two hours before.
Dolly's dumplings were indeed spun sugar and all the major productions bought their own sugar spinners and the prop man used a mix of white and brown for the dumplings.
"If my life weren't funny, it would just be true. And that would be unacceptable."
--Carrie Fisher