Just have to gather the crew, get their commitment ($$) and book the boat! I did talk to a charter company in RT, and they were not sold on the idea and were not including them on future boats. Considered them too fussy, which is the exact same impression I had. My understanding now is, with a close eye, it's worth the effort.
If you are a charter company with boats without water makers you need to convince your prospective customers that they don't want one.
