Great thread OP! This is important to offer wildlife relief however you can.

Yes to the birdbath!

I blast out old water replacing with clean water every day (so they don't pass along bird diseases). It gets rank pretty fast.

Then around 5 pm if it's really hot I'll turn the sprinkler on low so the water goes out only 3 1/2 ft or so.
They like to stand under it and fluff their wings...the bigger birds tend to hog the birdbath.