Is there an herbicide, LEGALLY available, that will utterly kill any grasses
and dandilions without poisioning the waterfoul or turn my yard and
surrounding countryside into a desert wasteland?

I'd like to spray a 18" strip around my house's foundation to rid myself of
all vegetation BEFORE I rototill it up and put down heavy fabric and rocks.
But I fear that anything that can kill bermuda grass (of which I have an
abundance) and rabbit brush will also lay my yard to waste