Well now I know what the word busker means. Damn US schools, oh wait, I never paid attention..... I was too busy learning ****....... (go ahead)

Anyway, the cheapest and easiest way I can think of is to just take the ground of the instruments' inputs and wire them to a wet rag laying on the ground, just fold it up and put the wire in between. Just pour water or beer on it from time to time, like when you are again getting zapped. Don't worry about grounds on the rest of the ****.

BTW, isn't there some sort of 12 volt syatem that can eliminate all this extra bull**** ?