Water Guns How Do I Get Permission To Have A Live Street RPG With Water Guns?

How do i get permission to have a live street RPG with water guns? - water guns

I want to play a role in the lively streets with water guns and rifles is already bio-degradable washing colored clothes when you put clothes powder detergent, and I have some friends who want to participate but what really allowed to do so, or I have a permit for all