Don’t have a pool? Make a leak-proof water blob. Don’t have a pool? Make a leak-proof water blob. I definitely won’t leave it out for more than 2 days because the grass under it was dying and stinky.
DIY Kids Water Wall by playingbythebook via curbly. this is more about play, but I think something a little more durable with this same idea might go well in the sideyard garden/play area.