Say that a fellow was looking to replace the standard drinking water
tank's drain plug with a fitting that provided a, say, male garden hose
bib fitting along with a shutoff valve ... does such a thing exist?

I ask because I was camping in the Oregon high desert this weekend and
was thinking (A) about a quick way to fill a bucket with water from the
Westy's drinking water tank in case of a campsite fire without dumping
the whole tank of water (I live in an arid environment so I worry about
every drop of spilled water); and (2) that the drain outlet on the water
tank could be a useful place to tap into a reservoir for a campsite
shower system.

So to replace the Westy water tank's drain plug with a fitting that has
a valve and some kind of standard hose fitting would be swell.

-- RJS