I hope that I can get some good advice here. I am 70 and have been diving for over 30 years and look forward to a few more years of diving. I usually dive about 2 weeks in the Caribbean in the winter time. Since I don't go more often, I rent a BC and regulator wherever I dive. I am rethinking this in light of Covid 19. Does anyone have recommendations for me to purchase a regulator and octopus setup? I don't want to spend a lot of money but want something that is good and reliable. Also, since I always rented, do I need a full set up or can I just get a regulator and swap it out on a dive shop's octupus?
Trying to be helpful here...
An "octopus" is actually the alternate second stage, not the full set up.
The full set up is a first stage regulator, two second stage regulators, a low-pressure inflator hose, and some kind of pressure gauge, perhaps that is part of a console along with a depth gauge and maybe a compass. One of the second stages is the the one you use -- your primary -- and the oher, typically on a longer hose, is the "alternate" or "safe second" or "octopus" for your buddy.
In order of increasing cost and complexity.....
(A) You could simply take your own cleaning solution for the second stage -- microban works well, as a spray -- and use their equipment. Spray it on, wait 10 minutes, rinse it off. Don't get the aerosol version; you can't fly with it. Get the bottle you have to pump.
(B) You could take a new mouthpiece to use on their second stage; they'll be happy to put it on for you, especially if you leave it on.
(C) You could take your own second stage and put it on the end of their low-pressure regulator hose; takes two wrenches and two minutes; or have them put it on.
(D) You could take your own second stage with its own hose and replace their hose/regulator (takes one wrench and two minutes); they might do it for you.
(E) You could take your own full regulator set and just use it; you'll spend at least $500 to do this. You'll also want to get it serviced, probably annually, for maybe $125 up.
I recommend (A).