I am fussy about my diet and straining my voice. I know sounds a bit over the top. But I'm not as bad as I used to be. These days I don't drink alcohol for five days before a show - very dehydrating for the vocal cords and all that acid reflux. I used to ban it for a fortnight. Nightmare.
I learned from Mr. Wrigley early in my career that loyalty wins and it creates friendships. I saw it work for him in his business.