I've never rigged up an actual bowfishing target for myself. I might, but haven't yet.

Where I usually go is a public area and therefore is visited regularly by idiots who think the world is their personal trash can. When I go out in the Spring and it's too early to find fish, I just practice on some sunken cans or bait containers. That's usually enough to knock the rust off from the Winter and get back into the swing of it.

I actually prefer to practice on live fish, since misses don't hurt anything.