Preferably dripping water as birds are attracted to the sound.
Birds love a slow sprinkler.
In the garden, I've noticed it really attracts lots of birds as they like to bathe in oscillating waters. Dust Bath Many birds enjoy taking a dust bath. It need not be large - a 2 x 3 foot area will do. Native species that produce fruit are good. Feed suet as part of your 'extra' help for the birds.