The first thing I addressed was cleaning up the pool. That goes a long
way towards keeping cool and not developing that 3d world smell.
Flushing toilets is the easy one. Just dump a bucket of water in it.
OTOH if you have a lift pump, it might just come up in your bath tub.
My septic is gravity operated. When they told me all new systems might
have to be mound systems I just fixed the one I had ... off the books.
Tiki bar builders know how to do that sort of thing ;-)