Don't stay "FAR AWAY" from Conch Charters. DO understand that they are using older vessels that WILL require extra attention during checkout. I seriously doubt that Conch pocketed your DD without explanation. More probable, your withholding the cause from your post.
The charter company is responsible for providing a safe, working vessel. They should give a detailed chart briefing and conduct a good check out process. It's your responsibility to make sure that all of the above has been accomplished prior to leaving the dock. Once the docklines are slipped it is up to the capt/crew to run a good trip. The charter company isn't responsible for water rationing or decision making. If you run out of water, ice or god forbid BEER. Its your responsibilty to obtain more.