In all seriousness improvised ammunition isn’t very hard and it’s doable. All you really need is primer powder and some kind of explosive. I won’t say how but both can be easily made and are pretty readily available. In the rare cases of id required, you can just start asking friends and neighbors if they have any handy.
I’ve got a strict hoa that you probably couldn’t play on it if you tried. Neighbor had a tiny swing hidden under their porch and got fined repeatedly before they took it down. I never see any kids playing on the grass. I bet all of the balls and toys laying about would give them an aneurysm.