I'm interested in full time RV living and some people change their toilet for compost ones, and then turn their black tank (toilet flushes) into a extra grey ta

I'm interested in full time RV living and some people change their toilet for compost ones, and then turn their black tank (toilet flushes) into a extra grey tank (sink, shower water... Washer or dishwasher if you have a fancy rig with it) Was watching and reading about them, but not sure If I'd like them... Someone kept a spray bottle to help clean the inside after each use if messy inside (think poop or maybe period blood). Then there's a little fan that is sorta like a PC fan... but was reading somewhere someone's went out and their RV got invaded by fruit flies! I like the idea of saving water when boondocking, but seems like some huge cons.