Just got back from a cruise and diving in Grand Caymen (soooo amazing, loving this diving thing

)! And I see more posts on this thread! To specify what I'm bringing, I will bring some craft beers (whatever I can get my hands on from friends etc.), some RUM (I looked for dark cruzan rum on the cruise, to no avail

)...and some side items/desserts. I plan on coming up after work on Friday, so I should get there by 7ish?
How does the tank rental go throughout the day? You rent two tanks, use them, rent two more? Just trying to figure out the costs for rental stuff for Saturday. Also, should I buy some snazzy sort of flashlight before then? Any advice for the newbie would be grand