If you rig it right, you can use a Detergent Jug (has vent) hosed to your
drain.  Looks just like a detergent jug often available in formal white,
ragin' red, checkmate deep blue.  Has a built in handle to carry to the
disposal site, wheels not required.  Can be used as a campfire
putter-outter.  We don't often create more than 1/2Gal of waste water a day
so this work fine.  It becomes a 'closed' system meeting various
requirements for 'closed' system greywater.   Easy to move, simple to make,
minimum enviromental impact using recycled components,  lasts a pretty long
time, you can empty it in a flush toilet with no adverse affects to you or
the plumbing and you can recycle the jug as a recyclable plastic.

If the pioneers of yore had to put up with today's restrictions, they'd
still be in Missouri hiring lawyers and fixin' to get ready to hunker down
and start findin' the handle to apply for permission to apply for a
preliminary permit.

The first fish is $41 all the rest are free for the year...